Synopsis:
$ addtabkey (<nick>)
Technical:
This function will add the specified nick into the tab key list
Practical:
By pressing tab you can cycle through the nicks that just messaged you
or nicks that are on the channel. addtabkey will add the specified nick
to the list.
Returns:
Nothing
Examples:
$addtabkey(panasync) will add panasync to tab key list
$addtabkey() won't return or do anything 