Update apsfilter port to 7.2.1

Important fixes for FreeBSD
Patches from files subdir went into this new release
General fixes:
       - remove apsfilter installation error when typing "make install"
          by using ln's -f (force) option to overwrite an existing symlink
          (just in case you overwrite another installation).

        - fix some HP driver mapping in MAPPING file

FreeBSD specific fixes:

        - make apspreview work again for FreeBSD (and possibly *BSD).
          BSD uses a sed implementation, that uses only "normal" regular
          expressions for backward compatibility not to break existing scripts.
          Linux (GNU sed) uses "modern REs". We use now awk which turns out
          to be more portable between different Unix flavours.
          We use awk instead of sed in other scripts as well (SETUP,
          aps2file).

        - import a patch from FreeBSD ports collection necessary for
          FreeBSD-current to use "user:group" syntax for chown. Old
          style "user.group" to change owner && group isn't supported
          anymore. Linux's implementation of chown (from GNU) groks
          new syntax.

Please note: hpijs 1.0 driver core dumps have been fixed by me some
	hours ago with the kind help of HP. So you can now savely
	use the new HPIJS driver with gs and apsfilter. Have fun.

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