Rename nethack ports and put version numbers in the port names.

nethack         -> nethack32
nethack-gtk     -> nethack32-gtk
nethack3        -> nethack33
nethack3-gnome  -> nethack33-gnome
nethack3-tty    -> nethack33-nox11
nethack-qt      -> nethack33-qt

user.group -> user:group in chown call(s).    

Remove MASTER_SITE_GNU from MASTER_SITES as the GNU mirror sites no   longer
have nethack distfiles.    

Update to nethack 3.3.1.    

I cannot imagine how this port could've worked without the missing  
PORTVERSION2 variable.    

Update to nethack 3.3.1.    

Convert category games to new layout.  

(1) Add new variable, XFREE86_VERSION, to specify which version of       XFree86
(3 or 4) to depend to when USE_XLIB is set.       XFREE86_VERSION defaults to 3
for now, but adventurous users can       override it in /etc/make.conf.  When
XFREE86_VERSION=3, USE_XLIB       will add a dependency to x11/XFree86; when it
is set to 4, the       dependency will be to x11/XFree86-4-libraries.  When     
 XFREE86_VERSION=4, the PKG_IGNORE_DEPENDS and ALWAYS_BUILD_DEPENDS       hacks
to avoid messing with XFree86 are turned off.    

Cope with FreeBSD 3.   Fixed the path to gzip.