Allow editing of messages in the outbox as long as they are not in the process of being sent.
Allow editing of messages in the outbox as long as they are not in the
process of being sent.

svn path=/trunk/kdenetwork/kmail/; revision=176344

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