Pysat

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* Initial support for Constellation objects, which allows operations and
analysis on mixed groups of Instrument objects. Developed by UT Dallas senior
undergraduate computer science students (UTDesign 2018).
* Bug fixes when iterating by file
* Added pysat_sgp4, a Two Line Element based satellite orbit propagator that is
coupled with ionosphere, thermosphere, and geomagnetic models. Supports
projecting these quantities onto the relevant spacecraft frame to create
signals suitable for satellite data simulation and testing. Routine uses
pyglow, pysatMagVect, sgp4, and pyEphem.
* Further along the road toward windows compatibility
* Fixed orbit number reporting in orbits.current
* Added support for Defense Meteorological Satellite Program (DMSP) Ion Velocity
Meter (IVM) data. Downloads from the Madrigal database.
* Added support for both sat_id and tag variations within filenames in the NASA
CDAWeb template
* Updated docummentation covering requirements for adding new instruments to
pysat

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* Improved robustness of Meta object when working with high and low order data
* Improved Meta test coverage
* Added dayside reconnection calculation for OMNI-HRO data
* Improved test behavior when instrument data could not be downloaded

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* Improved consistency when handling higher order metadata
* Improved translation of metadata within netCDF4 files to pysat standard
* Added pysatCDF as package requirement
* PEP8 upgrades throughout
* Updated load_netCDF4 routine to support ICON EUV files natively
* to_netCDF4 function updated to be consistent with load_netCDF4
* Meta object upgraded to handle more attributes by default
* Meta object has been upgraded to preserve case of variable and attribute names
* Metadata access is case insensitive for ease of use
* Changes to units_label or name_label are automatically applied to underlying
metadata
* Improved handling of custom units and name labels at Instrument level
* Additional functions added to Meta object, attrs, keys, keys_nD, has_attr,
routines that return preserved case
* Additional unit tests for Meta added
* Reduced resources required for unit tests
* Improved windows compatibility
* Added more unit tests for seasonal averages
* Added more simulated data types to pysat_testing2D
* Added initial support for ICON EUV
* Added initial support for ICON IVM
* Added support for version/revision numbers in filenames within Files class
constructor from_os

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* Many changes since the last note here.
* Unit tests have been expanded significantly, bug fixes as appropriate.
* Coverage is over 80%
* There are new requirements on loading routines to support testing.
* Instrument object prints out nice information to command line
* Attributes in netCDF and similar files are transferred to the Instrument
object as part of loading
* Added attribute 'empty', True if there is no data
* Orbit support significantly improved, multiple orbit types are supported
* Added concat to Meta
* Python 3 compatible
* Corrected intersection of data_padding and multi_file_day
* Added support for higher order MetaData objects, needed for DataFrame within
DataFrames
* Windows compatibility
* Additional scientific instrument support
* Initial support for sat_id in Instrument
* Files class will now remove duplicate file times rather than simply raise an
exception

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* Added manual_org flag to Instrument instantion. Simple file management flag.
* Improved COSMIC demo plotting
* Improved support for instruments with no files

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* Fixed error raised by pysat.utils.set_data_dir
* Partial unit test coverage for files class
* File tracking more robust
* Download methods now log off from server at the end of download
* Improved to_netcdf3 and load_netcdf3 routines, netcdf files produced pass
standards check