Sanitize hostname, allow hiding hostname commands.
Sanitize hostname, allow hiding hostname commands.

Hostnames will convert all spaces and underscores to dashes. All other non
alphanumeric characters will be removed from the name.

No reason to show users commands they can't use. Now hides information
like The current wemux hostname is set to..  and the name and reset
commands from the help screen.

zolrath/wemux,ecool/wemux,nilbus/wemux