Pysat

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* New Features
* netCDF4 files produced using `to_netcdf4()` now have an unlimited
time dimension
* Documentation
* Updated guidance on numpy version for installation
* Bug Fix
* Updated madrigal methods to simplify compound data types and enable
creation of netCDF4 files using `self.to_netcdf4()`.
* Updated ICON support for latest file organization on SSL servers

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* Documentation
* Improved organization of documentation on ReadTheDocs
* Bug Fix
* Adopted .readthedocs.yml to restore online documentation on ReadTheDocs
* Modified MANIFEST.in to include pysat_testing instruments
* Rename default branch as `main`

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* New Features
* Decreased time to load COSMIC GPS data by about 50%
* Added DE2 Langmuir Probe, NACS, RPA, and WATS instruments
* Updated `test_files.py` to be pytest compatible
* Added check to ensure non-pysat keywords supplied at instantiation
are supported by underlying data set methods
* Updates to instrument testing objects for consistency
* Changed madrigal methods to use `madrigalWeb` as a module rather than
calling it externally
* Added warning when FillValue metadata could lead to unexpected results
when writing a netCDF4 file
* Use conda to manage Travis CI test environment
* Update ICON instrument file structure
* Added NaN filter for metadata when writing netCDF4 files
* Test instruments now part of compiled package for development elsewhere
* Reviewed and improved documentation
* Custom instrument keywords and defaults are now always found in inst.kwargs
* Added support for ~ and $ variables when setting pysat data dir
* Added custom.attach to make transitions to v3.0 easier
* Deprecation Warning
* custom.add will be renamed custom.attach in pysat 3.0.0
* Several functions in coords will be removed in pysat 3.0.0. These
functions will move to pysatMadrigal
* geodetic_to_geocentric
* geodetic_to_geocentric_horizontal
* spherical_to_cartesian
* global_to_local_cartesian
* local_horizontal_to_global_geo
* methods.nasa_cdaweb.list_files will move to methods.general.list_files in
pysat 3.0.0.
* Documentation
* Fixed description of tag and sat_id behaviour in testing instruments
* Added discussion of github install, develop branches, and reqs to docs
* Bug Fix
* `_files._attach_files` now checks for an empty file list before appending
* Fixed boolean logic when checking for start and stop dates in
`_instrument.download`
* Fixed loading of COSMIC atmPrf files
* Fixed feedback from COSMIC GPS when data not found on remote server
* Fixed deprecation warning for pysat.utils.coords.scale_units
* Fixed a bug when trying to combine empty f107 lists
* Fixed a bug where `remote_file_list` would fail for some instruments.
* Made import of methods more robust
* Fixed `SettingWithCopyWarning` in `cnofs_ivm` cleaning routine
* Fixed cosmic load method definition to include altitude_bin
* Fixed pysat_testing method definition to include mangle_file_dates keyword
* Added small time offsets (< 1s) to ensure COSMIC files and data have unique
times
* Updates to Travis CI environment
* Removed `inplace` use in xarray `assign` function, which is no longer
allowed
* Removed old code and incorrect comments from F10.7 support
* Updated use of numpy.linspace to be compatible with numpy 1.18.
* Fixed output of orbit_info during print(inst)
* Fixed a bug when requesting non-existent files from CDAWeb (426)
* Improved compatibility of parse_delimited_filenames (439)
* Fixed bug assigning dates to COSMIC files
* Fixed bug limiting local time orbit breakdowns for instruments much slower
than 1 Hz

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* New Features
* Added new velocity format options to utils.coords.scale_units
* Improved failure messages for utils.coords.scale_units
* Added some tests for model_utils
* Added option to to_netCDF that names variables in the written file
based upon the strings in the Instrument.meta object
* Improved compatibility with NASA ICON's file standards
* Improved file downloading for Kp
* Added keyword ignore_empty_files to pysat.Instrument and Files objects
to filter out empty files from the stored file list
* Added slice and list ability to meta
* Converted all print statements to logging statements
* Updated cleaning routines for C/NOFS IVM
* Added S4 scintillation data to the cosmic-gps instrument
* pysat no longer creates a default data directory. User must specify
location
* User set custom attributes are transparently stored within Meta object and
are available via both Instrument and Meta.
* Improved robustness of required library specification across multiple
platforms
* Code Restructure
* Move `computational_form` to `ssnl`, old version is deprecated
* Move `scale_units` to `utils._core`, old version is deprecated
* Replace `season_date_range` with `create_date_range`, old version is
deprecated
* Added deprecation warnings to stat functions
* Added deprecation warnings to `ssnl` and `model_utils`
* Removed `pysat_sgp4` instrument
* Added cleaning steps to the C/NOFS IVM ion fraction data
* Bug fix
* Fixed implementation of utils routines in model_utils and jro_isr
* Fixed error catching bug in model_utils
* Updated Instrument.concat_data for consistency across pandas and xarray.
Includes support for user provided keywords.
* Fixed error introduced by upstream change in NOAA F10.7 file format
* Fixed bugs in DEMETER file reading introduced by changes in codecs
* Fixed issue with data access via Instrument object using time and name
slicing and xarray. Added unit test.
* Updated travis.yml to work under pysat organization
* Added missing requirements (matplotlib, netCDF4)
* Fixed a bug when trying to combine empty kp lists
* Updated travis.yml to work with python 2.7.15 and beyond
* Unit tests reload pysat_testing_xarray for xarray tests
* Updated setup.py to not overwrite default `open` command from `codecs`
* Updated Travis CI settings to allow forks to run tests on local travis
accounts
* Fixed keep method to be case insensitive
* Fixed a bug with COSMIC GPS downloads
* Fixed selection bugs in the DEMETER IAP, CNOFS IVM, and model_utils
routines
* Updated URL link in setup.py
* Documentation
* Added info on how to cite the code and package.
* Updated instrument docstring
* Corrected pysat.Instrument examples using COSMIC

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* New Features
* `pysatData` directory created in user's home directory if no directory
specified
* Added preliminary support for `xarray` to the `instrument` object
* Support for `today`, `tomorrow`, and `yesterday` as datetime objects
* Added `model_utils`, featuring preliminary support for data-model
comparison
* Added support for 1d median in seasonal averages
* Added routine to convert from kp to Ap
* Added `pyglow` integration support for python 3.x
* Added option to check that loaded data has a unique and monotonic time
index. Will be enforced in a future version.
* Refactored data access through the Instrument object and expanded testing.
* Added .empty attribute to Instrument object, True when no data loaded.
* Added .index access mechanism to Instrument object, providing consistent
access to the pandas DatetimeIndex associated with loaded data.
* Added mechanism to return a list of loaded variables, .variables.
* Added Instrument method to concat input data with data already loaded into
Instrument object.
* Updated format of printed dates to day month name and year,
01 January 2001.
* Added Instrument property .date, returns date of loaded data.
* Added download_updated_files, Instrument method that downloads any remote
data not currently on the local machine.
* Added remote_date_range, an Instrument method that returns first and last
date for remote data.
* Download method now defaults to most recent data (near now).
* Improves input handling for datetime parameters that are more precise than
just year, month, and day, where appropriate
* Added merging routines to allow combination of measured and forecasted Kp
and F10.7 indexes into a single instrument object
* Files class internally refactored to improve robustness.
* Added feature to handle delimited filenames, in addition to fixed_width
names.
* Exposed methods to allow users to more easily benefit from features in
Files. Used to support remote_file_lists and make data downloads more
convenient.
* Expanded testing with Files.
* Updated keyword names to be more complete. 'sec' to 'second', etc.
* Updated Files access mechanisms to remove deprecated calls and improve
robustness.
* Code restructure
* Moved instrument templates and methods to subdirectories
* Moved utils into multiple subdirectories to aid with organization
* Instrument Updates
* NASA CDAWeb download now uses https protocol rather than FTP
* `_instrument.py` supports xarray
* Support for listing files from remote server
* COSMIC RO data unified into single instrument object
* Added support for DEMETER IAP
* Added support for DMSP IVM Level 2 data. Uses OpenMadrigal.
* Added routines to update DMSP ephemeris and drifts
* Added warnings to instruments without download support
* Added preliminary support for ICON FUV and MIGHTI
* Added support for Jicamarca Radio Observatory ISR
* Added support for F10.7 and more Kp forecast products
* Added instrument templates for Madrigal, CDAWeb, and netcdf_pandas
* Added support for TIMED SABER
* Added support for UCAR TIEGCM
* OMNI HRO instrument now uses CDAWeb methods
* Switched download methods for CDAWeb and COSMIC data to use `requests`
* Added Madrigal methods
* Removed support for SuperDARN and SuperMAG downloads while server changes
are sorted out
* Updates to travis configuration
* Tests run for python 2.7 and 3.7
* Added display port to test plots
* Updates to community docs
* Added Issue templates
* Added Pull Request Template
* Added note for PR to be made to develop, not master
* Style updates throughout
* Consistent documentation for docstrings and instruments
* Cleaned up commented code lines
* PEP8 scrub
* Documentation
* Added FAQ section
* Added "powered by pysat" logo
* Updated supported instruments
* Unit Test Updates
* Dropped instrument templates from coverage
* Added multiple output options for `pysat_testing` object to aid with
constellation tests. Removed old constellation test objects.
* Added test data for space weather indices to speed up testing
* Cyclic data for test instruments now generated from single test method
* Test objects for xarray added
* Added test for parsed delimited files
* Removed ftp downloads from travis tests, still will run locally
* Bug fixes
* `pandas.ix` notation replaced with `pandas.loc` and `pandas.iloc`
throughout
* Fixed a bug that forced user into interactive mode in `ssnl.plot`
* Bug fixes and cleanup in demo codes
* Fix for orbit iteration when less than one orbit of data exists. Fix now
covers multiple days with less than one orbit.
* Fixed a bug in python 3.7 caused by change in behaviour of StopIteration
(207)
* Update to use of `len` on xarray to handle new behaviour (130)
* Updated import of reload statements now that python 3.3 has reached end of
life
* Updated deprecated behaviour of `get_duplicates`, `.apply`, and `.to_csv`
when using pandas
* Fixed bug in assigning units to metadata (162)
* Fixed timing bug introduced by reading only the first date/data pair from
each line in the 45-day file data blocks

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* SuperMAG support added
* Increased data access robustness when using integer indexing
* Added template for supporting netCDF4 based instruments (pysat_netCDF4)
* Added support for MSIS within the pysat satellite simulation (based on sgp4)
* Added plotting routine to sgp4
* Initial support for the upcoming NASA/INPE SPORT Ion Velocity Meter (IVM)
* Fixed bug triggerd when invoking multi_file_day option in Instrument object