Fix !resync; helpfile updates; improve ?modcmd

Fix !resync; helpfile updates; improve ?modcmd

* Make ChanServ.RESYNC op (or voice) users when GiveOps (GiveVoice,
respectively) is 0 and the user is not on the userlist.

* Remove mention of PEONINVITE from chanserv.help.

* Mention the GIVEOWNERSHIP command in HelpServ's help file; remove
mention of the removed VERSION and WRITE commands.

* Make modcmd.MODCMD accept no options, and display the (final)
settings for the command.  Update the help entry for it.
git-archimport-id: srvx@srvx.net--2004-srvx/srvx--devo--1.3--patch-27