Remove misc. copyrite.h functions

Remove misc. copyrite.h functions

- Replace Program() and ShortProgram() with calls to IProgramContext.
  This is now easier that there are at least basic catch-alls in place.
- Replace GromacsVersion() with gmx_version().
- Move gmx_thanx() to cmdlinemodulemanager.cpp, which was the only
  user (removed the non-essential use from gmx_anadock.cpp).

Change-Id: I46cd50cc9d4dfef3ff29aad067841b67948df7f8