Fix service triggers; allow service hostname configuration; fix glitches

Fix service triggers; allow service hostname configuration; fix glitches

* Improve length checking logic in ChanServ.names command.

* Fix service trigger registration so that database is used in
preference to srvx.conf and compiled-in defaults.

* Allow service hostnames to be configured in srvx.conf and through
"service add"; document this and show an example of setting the
service description.

* Fix an uninitialized value bug in OpServ.join.

* Make OpServ.addtrust accept a count of 0.

* Remove untranslated messages from languages/de/modcmd.help (so that
new "service add" help is inherited).
git-archimport-id: srvx@srvx.net--2004-srvx/srvx--devo--1.3--patch-47