Added a bot_restart function to restart a bot.
Created functionality to make announcement each 5 minutes (previously it
was only made once and nothing more). An event can
only have one announcement (must be owner or admin to create or remove
it).
Added functionality for signupbot to perform the OPER IRC command, to
login to a IRC server. This functionality has not yet been tested,
however, as I don't have access to the dikulan IRC server yet (the ports
are not opened from SCIENCE IT).