Backport some "delete this" -> deleteLater improvements.
Backport some "delete this" -> deleteLater improvements.

svn path=/branches/kdepim/proko2/kdepim/; revision=451874

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