Restrict selection to single, as import results can't be merged with current gpgme. Also fix a few crashes that were due to early usage of the selection model.
Restrict selection to single, as import results can't be merged with current gpgme. Also fix a few crashes that were due to early usage of the selection model.

svn path=/trunk/KDE/kdepim/kleopatra/; revision=799776

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