Unhandled user mode messages

[henk84]

I have been getting a number of warnings about rbot not handling a "user mode message":

WARN -- rfc2812.rb:1551:in `parse_mode': Unhandled user mode message ':irc-01.netwichtig.de MODE marvin :-x'
WARN -- rfc2812.rb:1551:in `parse_mode': Unhandled user mode message ':marvin!marvin@netwichtig-11shil.old4.iv74.04f9.2a01.IP MODE marvin :+B'
WARN -- rfc2812.rb:1551:in `parse_mode': Unhandled user mode message ':marvin!marvin@netwichtig-11shil.old4.iv74.04f9.2a01.IP MODE marvin :+x'
WARN -- rfc2812.rb:1551:in `parse_mode': Unhandled user mode message ':marvin MODE marvin :+B-I'
WARN -- rfc2812.rb:1551:in `parse_mode': Unhandled user mode message ':marvin MODE marvin :+ipwxzI'
WARN -- rfc2812.rb:1551:in `parse_mode': Unhandled user mode message ':NickServ MODE marvin :+r'
WARN -- rfc2812.rb:1551:in `parse_mode': Unhandled user mode message ':NickServ!services@services.netwichtig.de MODE marvin :+r'

I’m not sure whether these really have any negative effect but it would be great if those warnings did not appear and these messages were handled. Alternatively, the warning could be a bit more specific why it appears and what the bot-owner’s options are for making them disappear.