* Renamed ItemView to ItemDetailsView (matches its task better)

* Added ItemView, which is a TreeView for Items with convenience signals
* Modified CollectionView to emit a signal when collection is activated or
  selection has changed
* Modified CollectionModel to allow filtering by mime-types, e.g. show only
  collections which contains 'mail'
* Added KContactManager, a small address book like viewer, which shows the
  power of Akonadi. Only a couple of lines of code and it is done!

svn path=/trunk/KDE/kdepim/akonadi/libakonadi/; revision=707882