Resolve recursive bang-strings

[astronomyk]

Commit 13ac4db

• Simple recursive call that (should) catch multi-level band-strings
  (i.e. temperature = !TEL.temperature = !ATMO.temperature = 7)
• I also added a check to catch stringified floats, and turn them into floats. This is needed because when a single entry in a table column is a bang-string, and the other entries are floats, then astropy will read them all in as strings. And when the bang-string is resolved, it is reinserted as a string, rather than a float. This check solves that (I think)

Commit 7d8e3e6

• Additions to several classes, primarily the FilterWheelBase class which enable it also be treated as a TERCurve in the context of the plotting routines and summary table helper functions in OpticsManager. These changes are (solely) cosmetic and shouldn't affect any of the real scopesim machinary.

[codecov]

Codecov Report

Attention: 11 lines in your changes are missing coverage. Please review.

Comparison is base (c4c2264) 75.15% compared to head (7ba4334) 75.13%.

Files	Patch %	Lines
scopesim/effects/ter_curves.py	45.45%	6 Missing ⚠️
scopesim/__init__.py	50.00%	2 Missing ⚠️
scopesim/version.py	50.00%	2 Missing ⚠️
scopesim/utils.py	88.88%	1 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff               @@
##           dev_master     #351      +/-   ##
==============================================
- Coverage       75.15%   75.13%   -0.03%     
==============================================
  Files              59       59              
  Lines            7970     7999      +29     
==============================================
+ Hits             5990     6010      +20     
- Misses           1980     1989       +9     

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