validation testing against Tax-Calculator in TB release

[MattHJensen]

PSLmodels/Tax-Calculator#1119 indicates that the TaxBrain release process could benefit from (more) validation testing against Tax-Calculator.

The baseline results from TaxBrain should be extremely close to those in the pufcsv_agg_expect.txt that the Tax-Calculator team generates from the requires_pufcsv tests.

One option would be to compare against those results with a tolerance. Another would be to add new requires_pufcsv tests that generate a dropq baseline.

@talumbau, what do you think?

[MattHJensen]

@hdoupe, do you think this issue should remain open?

[hdoupe]

@MattHJensen, I am working on similar tests in PR #627. This issue could be closed in favor of #615 and #602.

[MattHJensen]

Thanks @hdoupe. Closing.