[IRCServices] /identify with linked nicks

[Georges Berscheid]

Hi,

I might have missed something, but I observed the following scenario in
version 4.5.21 :

foo and bar are 2 registered nicks with bar linked to foo.
User blah joines the network
blah changes nick to foo.
foo is asked to identify, but since he does not know it, he changes nick to
bar.
bar is not asked to identify anymore

Although bar is not allowed to change any properties of that nick (since not
identified) he can stilil continue using the nick. I personally don't like
that feature too much.

Greetings

Georges