Linelists: make lookuptables a little more robust

[keflavich]

The lookuptables used in linelist searches are a little touchy because of lines like HCO+ and HOCO+. You have to escape the +'s to get them to work, which means that even exact matches to molecules, like 29002 HCO+ v=0,1,2 will not work.

This change means that exact matches will work, while partial matches will still need to be escaped.

[codecov[bot]]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (5600762) 67.23% compared to head (869de3d) 67.23%. Report is 2 commits behind head on main.

Files	Patch %	Lines
astroquery/jplspec/lookup_table.py	50.00%	1 Missing :warning:
astroquery/linelists/cdms/core.py	50.00%	1 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2901      +/-   ##
==========================================
- Coverage   67.23%   67.23%   -0.01%     
==========================================
  Files         235      235              
  Lines       18155    18159       +4     
==========================================
+ Hits        12207    12209       +2     
- Misses       5948     5950       +2     

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[keflavich]

This should probably go into a slightly larger refactor too:

• move jplspec to linelists
• move the lookup_table function to linelists so cdms & jpl both use the same code