some csv.gz files break when ReEDS is downloaded as zip

[bembrin]

This issue has been observed on SM_EasySetup and master.
It appears that the .csv.gz files in ./inputs/variability/* break LDC_prep.py when ReEDS is extracted from a zip file producing this traceback.

ERROR:__main__:Traceback (most recent call last):
  File "inputs_case\LDC_prep.py", line 316, in <module>
    hourly_prep(all_year_load,scenario,static_inputs,basedir)
  File "inputs_case\LDC_prep.py", line 110, in hourly_prep
    load_profiles = pd.read_csv(os.path.join(path_variability, static_inputs, 'load.csv.gz'), index_col=0, float_precision='round_trip')
  File "C:\Users\na\ReEDS_OpenAccess\ReEDS_OpenAccess-SM_EasySetup\gams\30.3\GMSPython\Lib\site-packages\pandas\io\parsers.py", line 688, in read_csv
    return _read(filepath_or_buffer, kwds)
  File "C:\Users\na\ReEDS_OpenAccess\ReEDS_OpenAccess-SM_EasySetup\gams\30.3\GMSPython\Lib\site-packages\pandas\io\parsers.py", line 454, in _read
    parser = TextFileReader(fp_or_buf, **kwds)
  File "C:\Users\na\ReEDS_OpenAccess\ReEDS_OpenAccess-SM_EasySetup\gams\30.3\GMSPython\Lib\site-packages\pandas\io\parsers.py", line 948, in __init__
    self._make_engine(self.engine)
  File "C:\Users\na\ReEDS_OpenAccess\ReEDS_OpenAccess-SM_EasySetup\gams\30.3\GMSPython\Lib\site-packages\pandas\io\parsers.py", line 1180, in _make_engine
    self._engine = CParserWrapper(self.f, **self.options)
  File "C:\Users\na\ReEDS_OpenAccess\ReEDS_OpenAccess-SM_EasySetup\gams\30.3\GMSPython\Lib\site-packages\pandas\io\parsers.py", line 2010, in __init__
    self._reader = parsers.TextReader(src, **kwds)
  File "pandas\_libs\parsers.pyx", line 537, in pandas._libs.parsers.TextReader.__cinit__
  File "pandas\_libs\parsers.pyx", line 711, in pandas._libs.parsers.TextReader._get_header
  File "pandas\_libs\parsers.pyx", line 905, in pandas._libs.parsers.TextReader._tokenize_rows
  File "pandas\_libs\parsers.pyx", line 2034, in pandas._libs.parsers.raise_parser_error
  File "C:\Users\na\ReEDS_OpenAccess\ReEDS_OpenAccess-SM_EasySetup\gams\30.3\GMSPython\lib\_compression.py", line 68, in readinto
    data = self.read(len(byte_view))
  File "C:\Users\na\ReEDS_OpenAccess\ReEDS_OpenAccess-SM_EasySetup\gams\30.3\GMSPython\lib\gzip.py", line 463, in read
    if not self._read_gzip_header():
  File "C:\Users\na\ReEDS_OpenAccess\ReEDS_OpenAccess-SM_EasySetup\gams\30.3\GMSPython\lib\gzip.py", line 411, in _read_gzip_header
    raise OSError('Not a gzipped file (%r)' % magic)
OSError: Not a gzipped file (b've')

7zip is also unable to extract these files manually. ReEDS functioned normally when these files were replaced with files from a working installation of ReEDS.