Fix bug where nicks could be missing the first char(s) in the nicklist

When a nick contains a PREFIX symbol that isn't at the beginning of
the nick, the _kiwi.model.Member#stripPrefix function would still
count it as a part of the prefix and remove an unrelated character
from the front of the nick.
Merge pull request #402 from M2Ys4U/nick_trunc_fix

 Fix bug where nicks could be missing the first char(s) in the nicklist
Refactor _kiwi.model.Member#stripPrefix
Rename j_loop to nick_character_loop and j_char to nick_char
Merge pull request #403 from M2Ys4U/nick_trunc_fix

Refactor _kiwi.model.Member#stripPrefix
/clear command fix
panel.addMsg moved to models/channel.js

Not every panel needs .addMsg such as applets.
Remove unused conf.cap_options from example config
Customisable realname on irc connections #401
New IRC connection - don't send redundant con_num to client on connection error