Implement item #1011114, #997053

* Adjust the default max_greetlen to 200 (since greetings are now
  unconditionally capped at one line of output).

* Allow DNRs to be shown for accounts that currently do not exist.
git-archimport-id: srvx@srvx.net--2004-srvx/srvx--devo--1.3--patch-79