Remove old development files
Remove distro-centric GPL licensing file

This file is already included in the main Licensing/ dir.
Update TODO
Move TODO under doc/
Add COPYING, ChangeLog, & README
Update TODO (makefile feature; reformatting)
Update Copyright notice for OpenVPN development maintenance
Remove unnecessary quotes around empty var assignments
TODO: Add dupe CN detection to list
Update headers in vars.example and openssl-1.0.cnf