Initial commit, renamed from cpblStata.

Next commits may involve reckless cutting of comments and oldish functions.
Created a demo module

It is to pull together the minimal sets of tools to get a regression
running and compiling to LaTeX.
Added cpblDefaults.py here temporarily

This should be removed when possible. It just sets some file paths, but
is not specific to pystata. One of many things to excise/modularize.