The Bison code breaks in Bison 2.7 or newer.  We don't have any changes
planned for the parser itself in the near term, so this commit adds a
version of the parser generated with Bison 2.5 back to the repo for now.

- no longer used by triton model

- delete generated files from repo
- add txt_configfile to library

automake rules could probably be cleaner, just getting it to
build/install for now

- simplified configure.ac
- moved code from src/common to src directory
- misc minor fixes