Turn off plotting by default

[jdebacker]

This PR turns off all plots in the calibration files as the default. The run_og_usa.py script still produces and saves some plots of the output to disk after the baseline and reform runs complete.

cc @talumbau @rickecon

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 75.41%. Comparing base (4c0e3d8) to head (f01b59b).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #101      +/-   ##
==========================================
- Coverage   78.70%   75.41%   -3.30%     
==========================================
  Files          11       11              
  Lines         850      850              
==========================================
- Hits          669      641      -28     
- Misses        181      209      +28     

Flag	Coverage Δ
unittests	75.41% <ø> (-3.30%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
ogusa/bequest_transmission.py	56.52% <ø> (-34.79%)	⬇️
ogusa/calibrate.py	37.41% <ø> (ø)
ogusa/transfer_distribution.py	62.79% <ø> (-27.91%)	⬇️

[rickecon]

@jdebacker. Thanks for this. Looks great. Merging.