+ - Implement channel exception list (mode 'e'). This allows a channel
+ operator to define exception masks that allow users to join the
+ channel even when a "ban" would match and prevent them from joining:
+ the exception list (e) overrides the ban list (b).
+ - Implement user mode 'C': If the target user of a PRIVMSG or NOTICE
+ command has the user mode 'C' set, it is required that both sender
+ and receiver are on the same channel. This prevents private flooding
+ by completely unknown clients.
+ - New RPL_WHOISREGNICK_MSG(307) numeric in WHOIS command replies: it
+ indicates if a nick name is registered (if user mode 'R' set).
+ - Limit channel invite, ban, and exception lists to 50 entries and fix
+ duplicate check and error messages when adding already listed entries
+ or deleting no (longer) existing ones.