cleanups and fixes

cleanups and fixes

Fix the response when trying to set an option to an invalid access level.

Put accurate headers on zoot_list !users output.

Reduce default addban/addtimedban/delban access levels to 250.

Add advertising/support plug for #srvx.

Handle (but report) IRC socket connection errors.
git-archimport-id: srvx@srvx.net--2004-srvx/srvx--devo--1.3--patch-3