Bug (unintentional feature) fixes

[Sparks29032]

Multiple-morphs and multiple-targets no longer breaks when there are subdirectories within the directories you are applying the morphs in.

Updated the Rw calculation to no longer be Chi-Squared

Changed the color defaults, so morph is blue and target is red. This is as we want users to morph lower-temperature data with higher-temperatures as targets.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.01%. Comparing base (4914488) to head (426671e).
Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #184      +/-   ##
==========================================
+ Coverage   96.99%   97.01%   +0.02%     
==========================================
  Files          19       19              
  Lines         831      837       +6     
==========================================
+ Hits          806      812       +6     
  Misses         25       25              

Files with missing lines	Coverage Δ
tests/test_morphapp.py	99.04% <100.00%> (ø)
tests/test_morphio.py	100.00% <100.00%> (ø)
tests/test_tools.py	98.90% <100.00%> (+0.07%)	⬆️

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