expose verbose option to python

[koide3]

• Expose verbosity option to python
• Tweak convergence checks

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.32%. Comparing base (f48faf0) to head (e1f77dd).
Report is 1 commits behind head on master.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master      #77      +/-   ##
==========================================
+ Coverage   94.30%   94.32%   +0.02%     
==========================================
  Files          38       38              
  Lines         843      846       +3     
  Branches       79       79              
==========================================
+ Hits          795      798       +3     
  Misses         48       48              

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