Adds number of <18, 18-64, >64 people per household sorted by head age and income bracket, using PSID and CPS data

[prrathi]

The psidhousehold.py and cpshousehold.py files added to the ogusa_calibrate folder contain the scripts that read data- from psid_data_setup.py for PSID and PSL's cps dataset for CPS- and output csv files and images for each one. Per suggestion by @rickecon and @MaxGhenis , the psid.csv and cps.csv files are in their respective folders within ogusa_calibrate/data, and contain ordered by head age and income bracket the average number of people in each age group originally and then after smoothing. The images depict these transformations for each age group of each data type and are outputted to ogusa_calibrate/data/images.

[codecov-commenter]

Codecov Report

Merging #37 (f70a4f3) into master (93cab3d) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #37   +/-   ##
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  Coverage   63.13%   63.13%           
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  Files           8        8           
  Lines        1188     1188           
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  Hits          750      750           
  Misses        438      438           

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unittests	63.13% <ø> (ø)

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[jdebacker]

I would suggest that the csv and image files not a a part of this repo, but it'd be good to share useful images in this discussion.

BTW, here's a study talking about creating tax units from the PSID.

[rickecon]

This PR has been superseded by PR #39. Closing.