PR 110 redux

[andreww]

@aturner's PR #110 with merge conflict resolved and a test added

As previously: Adds the option to set CATS_CONFIG_FILE environment variable to specify config file location. Config file location precedence becomes:

1. Command line option
2. Location specified in CATS_CONFIG_FILE
3. ./config.yaml

[codecov]

Codecov Report

Attention: Patch coverage is 76.92308% with 3 lines in your changes missing coverage. Please review.

Project coverage is 87.20%. Comparing base (99737e8) to head (fe6d200).

Files with missing lines	Patch %	Lines
cats/configure.py	66.66%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #121      +/-   ##
==========================================
- Coverage   88.48%   87.20%   -1.29%     
==========================================
  Files          14       14              
  Lines         573      586      +13     
==========================================
+ Hits          507      511       +4     
- Misses         66       75       +9     

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[andreww]

All looked okay in PR #110 - could somebody review and merge?

[abhidg]

Looks good! Doesn't look like CATS actually loads config.yaml (only config.yml) though, so we should change the docs to match