HlA-1059: Reference catalog weights corrected

[s-goldman]

This PR corrects the weighting of the reference catalogs; the code now uses 1/sigma**2. The important lines of code are 283 and 284. I also added line 281 to avoid a possible divide by zero error. The remaining changes are the result of code formatting (black).

[codecov]

Codecov Report

Patch coverage: 67.44% and project coverage change: +0.02 🎉

Comparison is base (00022f6) 32.36% compared to head (ea368d5) 32.39%.

❗ Current head ea368d5 differs from pull request most recent head 451672d. Consider uploading reports for the commit 451672d to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1616      +/-   ##
==========================================
+ Coverage   32.36%   32.39%   +0.02%     
==========================================
  Files         159      159              
  Lines       35053    35056       +3     
==========================================
+ Hits        11345    11355      +10     
+ Misses      23708    23701       -7     

Impacted Files	Coverage Δ
drizzlepac/haputils/config_utils.py	68.54% <0.00%> (-0.46%)	⬇️
drizzlepac/haputils/product.py	66.07% <68.63%> (+0.05%)	⬆️

... and 3 files with indirect coverage changes

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[mdlpstsci]

Since SCSB only has a general set of standards (https://innerspace.stsci.edu/display/SCSB/Code+standards+refresher), and not a specific package we are supposed to use, I have tried to keep my opinion to myself. However, there are a few places where I found the Black code updates to make the code harder to parse. Please address these few items.

Changes made

[mdlpstsci]

@s-goldman Where is the update to the "wfpc2_wfpc2_index.json"?

[mdlpstsci]

@s-goldman Oops. I was checking both your PRs and made a comment in the wrong PR. The change to the parameter index file needs to be in PR#1052 and not this PR for proper tracking of history. Please remove the changes for config_utils.py from this PR and put into PR#1052. Once that is done, this PR is ready to go.

[s-goldman]

@s-goldman Oops. I was checking both your PRs and made a comment in the wrong PR. The change to the parameter index file needs to be in PR#1052 and not this PR for proper tracking of history. Please remove the changes for config_utils.py from this PR and put into PR#1052. Once that is done, this PR is ready to go.

I'm sorry, I should have caught that. The change to config_utils is now in the HLA-1052 PR.

[mdlpstsci]

Thanks for all the fixes!