libathemecore: fix logging to !snotices

Since neither "!snotices" nor "!wallops" starts with a '#', they were
treated as filenames.
Merge pull request #189 from grawity/fix-snotices

libathemecore: fix logging to !snotices
nickserv/resetpass: Allow specifying any grouped nickname

Closes atheme#191
Merge pull request #194 from grawity/resetpass-by-nick

nickserv/resetpass: Allow specifying any grouped nickname
nickserv/drop: request confirmation when dropping an account

Drop it ChanServ style, because apparently people keep expecting it to
do the same as RELEASE and GHOST...
Merge pull request #196 from grawity/nickserv-confirm-drop

nickserv/drop: request confirmation when dropping an account