PREFIX=@+" in dancer-ircd confuses irssi

Hi,

This was reported on #irssi by soroh:
Irssi doesn't seem to process the "PREFIX=@+" dancer-ircd (for example 
freenode) send correctly. It doesn't see @ and + as prefixes anymore, and 
thinks +o and +v are modes on the whole channel, not on a nick.
"@+" instead of "(ov)@+" is not following the specifications in larne's 
draft for the 005 numeric, but imo it should get interpreted correctly 
anyways.

Some quotes from #freenode:
"clients shouldn't really assume () is present unless the server declares 
compatibility with larne's draft, which is another field in the 005 thingy"
"in the absence of (), modes other than @+ (and possibly %) are an error and 
should be ignored"
"we're not going to support larne's draft directly anyway, although aside 
from that one I believe all the listed fields are compatible"

Greets,

Wouter aka coekie.

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