Deal with integer FITS files with BLANK keywords

[pkgw]

Overview

It turns out that reproject has a bug in dealing with integer FITS images that have BLANK keywords. This affects the cutouts images processed by daschlab. This should be fixed upstream, but that might take a while, so in the meantime let's work around it.

We also refresh the API docs and add a script to help make sure they get updated regularly.

Checklist

• Changed code has some test coverage (or justify why not)
• Changes in functionality documented (or justify why not)

No test coverage, sorry :-(

[pkgw]

Upstream bug report is astropy/reproject#475 .

[pkgw]

Also adding multi-wcs support here since it turns out to be a small change.

[codecov]

Codecov Report

Attention: Patch coverage is 57.14286% with 3 lines in your changes missing coverage. Please review.

Project coverage is 56.37%. Comparing base (f20f1f4) to head (00160f3).
Report is 7 commits behind head on master.

Files with missing lines	Patch %	Lines
pywwt/utils.py	57.14%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #378      +/-   ##
==========================================
- Coverage   56.40%   56.37%   -0.04%     
==========================================
  Files          25       25              
  Lines        2863     2870       +7     
==========================================
+ Hits         1615     1618       +3     
- Misses       1248     1252       +4     

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