Updates to run_og_usa.py

[jdebacker]

This PR cleans up the run_og_usa.py script, making it clearer and saving output a common directory.

[jdebacker]

Unsure of why tests were failing, but I think it may be related to an incompatibility between ParamTools and a recent version of marshmallow, as found in Tax-Calculator.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 90.90909% with 1 line in your changes missing coverage. Please review.

Project coverage is 45.22%. Comparing base (5e93add) to head (9ab32cc).
Report is 12 commits behind head on master.

Files	Patch %	Lines
ogusa/psid_data_setup.py	83.33%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #122      +/-   ##
==========================================
+ Coverage   45.12%   45.22%   +0.10%     
==========================================
  Files          18       18              
  Lines        1405     1404       -1     
==========================================
+ Hits          634      635       +1     
+ Misses        771      769       -2     

Flag	Coverage Δ
unittests	45.22% <90.90%> (+0.10%)	⬆️

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

Files	Coverage Δ
ogusa/__init__.py	100.00% <100.00%> (ø)
ogusa/calibrate.py	38.73% <ø> (+0.97%)	⬆️
ogusa/get_micro_data.py	94.02% <100.00%> (ø)
ogusa/macro_params.py	100.00% <ø> (ø)
ogusa/utils.py	85.84% <100.00%> (ø)
ogusa/psid_data_setup.py	98.78% <83.33%> (ø)

[rickecon]

@jdebacker . This looks great. Merging.