Compare synthetic PUFs to true PUF

[donboyd5]

As discussed in #24, we'll put results of these comparisons here. As noted there:

I have pushed the repo EvaluateWtdSynFile to https://github.com/donboyd5/EvaluateWtdSynFile.

This is an R project that (mostly) examines the weighted synthetic files in comparison to the weighted true PUF. It also does some exploratory analysis on unweighted variables and exploratory analysis of tax calculations. It writes an html file to a publicly viewable Google Drive folder.

I have cleaned it up a little so it should be easier for @andersonfrailey to make sense of, but you might still want to have a phone conversation with me after you take a look through it.

I updated it to put variable descriptions on CDF graph titles, so if @MaxGhenis looks at the updated eval_excl_taxcalc_2018-12-14.html, the graphs will be easier to understand.