More or less complete rewrite of CollectionSync:

- can in theory handle hierarchical RIDs, untested due to lack of
  support for that in most other areas
- much more efficient processing of collections that initially have no
  local parent node
- streaming support
- processes incremental changes in the right order which should fix the
  sync fails after config change bug of the single file resources
- prepared to make use of batch jobs for collection creation/deletion
  which should fix the performance issues with the NNTP resource

There is still more to do, but this seems to work at least as good as
the old one.

svn path=/trunk/KDE/kdepimlibs/; revision=1004234