I implemented PKG_GROUPS for comms/xisp (just PR'd).

I think that a DIALER_GROUP could be used for hylafax, minicom, and ppp
(net/ppp package I need to submit).

Anyways, when deinstalling xisp, I receive the following message:

-=-=-
If you won't be using xisp-2.6p1nb1 any longer, you may want to
remove

  * the following groups:  dialer
-=-=-

Is it smart enough to know if the group is in use by other installed
packages like minicom, hylafax, etc and don't give this message?

   Jeremy C. Reed
   http://bsd.reedmedia.net/