inn.conf: Support for `newsuser', `newsgrp' options (patch is, hopefully, included)

[Ivan Shmakov]

>>>>> Russ Allbery <rra at stanford.edu> writes:

 > I'm hoping to be able to comment further next week when I'm on
 > vacation, but the patch looks generally good.

	TIA.

 >> Yes it does.  But I only wanted to be sure (in this case, it should
 >> be #newsuser and #newsgrp in inn.conf, all commented).

 > newsgrp is sort of unfortunately cryptic.

	Well, I've just adopted the names that were already there.

 > newsgroup is sort of unfortunately confusing.  I wonder if we can
 > come up with option names that are both less cryptic and less
 > confusing.

 > runasuser and runasgroup, maybe?

	Don't these look like assuming setuid ()?  No objections
	otherwise.