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

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* Added missing file close statement in SuperDARN load command
* Fixed COSMIC UTS bug
* Fixed check for unique datetimes associated with files
* Improved instrument docstrings
* Added step size (freq) keyword to bounds and download methods
* Added C/NOFS IVM and COSMIC GPS demo
* Added support for OMNI data, 1 and 5 min files, time shifted to magnetopause
* Moving toward Python 3 compatibility
* PEP8 improvements
* Fixed demo ssnl_occurence_by_orbit file, replaced `binx` with `bin_x`
* Doubled loading performance for SuperDARN grdex files (3 seconds down to 1.5)