fixed bug when checking a nick for permissions; added output of a nick or command's current permission settings
fixed long-standing uninit var warning when a URL produces no title
fixed output order of scrollback command
plugin commands now checked for permissions before being run; available commands list only collected once, then cached (will need to be revisited if/when per-channel/server disabling/enabling of commands or plugins is implemented)
move all db-touching plugins to use ->db method instead of instance variable (as it should've been, had i not been lazy early on)
same as previous, but missed some of the called inside RoboBot itself (aside from the ones in the db() method, which are the only ones that should refer directly to the instance variable)
move all uses of the bot's configuration object to the RoboBot config() method