Move the snapshot date from PORTREVISION to being a part of PORTVERSION
to allow for PORTREVISION bumps.
Simplify pre-everything and adjust PLIST_SUB accordingly.
Extract SUFFIX from PORTVERSION. Use SUFFIX for TARGLIB (and thus for
the library path used by this port). Also use SUFFIX for the libexec
directory instead of the full port version and flatten the directory
structure and simplify the logic along the way.
Move VERSIONSTRING down to pacify portlint after all those years and
extract it from PORTVERSION, too.
Make the determination of CONFIGURE_SCRIPT more robust.
Address a long term FIXME related to older versions of FreeBSD by
Adjust Makefile header; nothing really left from the original.