New plan: instead of parsing in Stata, offload the work to C
New plan: instead of parsing in Stata, offload the work to C

This is a biiiiit awkward because C-Stata can't actually make new variables,
so it's going to be a two-step process.
This is step 1: prereading.

quevedin/statasvm,quevedin/statasvm,quevedin/statasvm