read_spectrum as a wrapper around Spectrum1D.read

[drvdputt]

I found that the specutils reader doesn't care if the columns are named 'sigma' or 'stddev'. So just by changing the reader to Spectrum1D, we can now read in all our included spectra.

I also added a test for this read-in step. It was already useful to iron out some bugs and convince myself that this will work for everything we need. Should be useful in the future too, when new example spectra get added.

[drvdputt]

Thanks to this test, I found another bug: the data files in the subdirectories of pahfit/data are not installed!

The solution is to put these in setup.cfg too (I don't think recursive glob syntax is supported by setup.cfg). Adding a commit that does this.

[codecov-commenter]

Codecov Report

Merging #244 (284dc03) into dev_yaml-scipack+api (fa7d296) will increase coverage by 0.03%. The diff coverage is 81.81%.

@@                   Coverage Diff                    @@
##           dev_yaml-scipack+api     #244      +/-   ##
========================================================
+ Coverage                 63.02%   63.06%   +0.03%     
========================================================
  Files                        14       14              
  Lines                      1025     1026       +1     
========================================================
+ Hits                        646      647       +1     
  Misses                      379      379              

Impacted Files	Coverage Δ
pahfit/helpers.py	38.09% <81.81%> (+0.74%)	:arrow_up:

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[jdtsmith]

This LG2M @drvdputt. For helpers.py are we just leaving the barest-bones things there now?