[mICQ] add user prompt command and fix manuals

[Max Komar]

          > > http://core.org.ua/tmp/micq/micq-cvs_2007-04-07_user-prompt-and-fix-doc.0.6.patch.gz  
> > with uiG.conn  
> Okay, applied except for the i18n with minor changes (cosmetics and back  
> to %U for user instead of %I). Please re-sync.  
  
> > What do you think, maybe better and logic put prompt to optglobal or optconnection?  
> Do you think people would set a different prompt depending on the current  
> session? If yes, then optconnection would be a good idea. Otherwise, I'd  
> prefer the "prompt" command to be within "set". :)