Log Message:
Rename print/cups to print/cups-base to depend on cups-filters

This change:
- renames print/cups to print/cups-base,
- lets print/cups-filters depend on print/cups-base instead of cups,
- adds a package print/cups depending on print/cups-base and
  print/cups-filters.

This makes sure installing print/cups always installs
print/cups-filters, as it is necessary for being able to print outside
of Mac OS X since CUPS 1.6.0. You're welcome.

I do not think superseding is necessary, since print/cups will also
install print/cups-base, which really is the same as before. In practice
it is like a new dependency. I do not want to risk a bad "cvs import"
either, sorry.

Bumps PKGREVISION for print/cups and print/cups-filters, since they have
new dependencies now. This is also necessary for everything else currently
depending on print/cups; I will try to commit this right after this one.

Tested on NetBSD/amd64, as reviewed on tech-pkg@.
No breakage observed, apologies if anything goes wrong.