deliver() documentation + some small fixes

[ponyisi]

• Add documentation for deliver()
• Change function order in the autodoc
• Add __version__ to servicex
• Show contents of servicex module before subpackages
• Add expanded to ProgressBarFormat
• Bump default git version to 3.1.1-alpha1

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.74%. Comparing base (a3c989a) to head (5255f87).
Report is 13 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #558      +/-   ##
==========================================
+ Coverage   92.59%   92.74%   +0.15%     
==========================================
  Files          29       29              
  Lines        1823     1847      +24     
==========================================
+ Hits         1688     1713      +25     
+ Misses        135      134       -1     

Flag	Coverage Δ
unittests	92.74% <100.00%> (+0.15%)	⬆️

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