[IRCServices] Feature: nickchange and guestnickprefix

[Alexander_Zverev at oxy.com]

> >This situstion are very highly unlikely, isn`t? 
> >Improve randomization, add one more check, that`s it.
> >Anyway, services ask password again.
> 
>      If you, as a new user, encountered this situation, how 
> would you feel to have your nick repeatedly changed every 60 
> (or even 20) seconds when you're not even familiar with how 
> the registration system works?

Then this person is VERY LUCKY, if his randomly-generated nick always
set to one of registered. Improve randomization to decrease probability
of this situation, or check in nickserv database for newly generated
nick.

Why you do this so complicated?