prevent the user from entering already used identity names instead of shouting at him if he does
prevent the user from entering already used identity names instead
of shouting at him if he does

svn path=/trunk/kdenetwork/kmail/; revision=128236

lefou/kdepim-noakonadi,lefou/kdepim-noakonadi,lefou/kdepim-noakonadi,lefou/kdepim-noakonadi,lefou/kdepim-noakonadi,lefou/kdepim-noakonadi