This is my idea for not auto-filling nroff directive lines.  I struck it
on a long .URL line (a groff extension).  I think comment lines like .\"
should still auto-fill, as the do now, though they don't actually come
out quite right yet (neither before nor after this change).

2007-10-12  Kevin Ryde  <user42@zip.com.au>

	* textmodes/nroff-mode.el (nroff-mode): Set auto-fill-inhibit-regexp
	so as not to auto-fill on directive lines other than comment
	directives.