Make use of the newly added RID-based collection deletion.
Make use of the newly added RID-based collection deletion.

svn path=/branches/work/akonadi-ports/kdepim/; revision=984945

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