Implement folder deletion.
Implement folder deletion.

svn path=/branches/work/akonadi-ports/kdepim/; revision=1010703

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