Debugging dunder escape

[tclose]

• fixed frametree_home scoping in conftest
• moves path2label into frametree core
• adds internal_upload option to XnatViaCS and sets API as the default upload method
• type annotations

[codecov]

Codecov Report

Attention: Patch coverage is 83.63636% with 9 lines in your changes missing coverage. Please review.

Project coverage is 81.57%. Comparing base (71621b9) to head (44a4852).
Report is 13 commits behind head on main.

Files with missing lines	Patch %	Lines
frametree/xnat/cs.py	70.96%	5 Missing and 4 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main       #3      +/-   ##
==========================================
+ Coverage   78.37%   81.57%   +3.20%     
==========================================
  Files           4        4              
  Lines         370      380      +10     
  Branches       68       49      -19     
==========================================
+ Hits          290      310      +20     
+ Misses         65       57       -8     
+ Partials       15       13       -2     

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