Move Program() and ShortProgram() into copyrite.h

Part of effort to split up statutil.* into their component parts.
The most natural place could be utility/programinfo.h, but that would
require extra effort.  With some C++ conversion, we could also
completely get rid of at least Program(), so did not want to go through
that now.  copyrite.h already has GromacsVersion(), so this somehow
fits.

Change-Id: If82e0e924025ab782f090cb5b0542a6d01689d9e