access to search service
Implemented: Section criterion visitor
Implemented: RemoteId criterion visitor
Implemented: LocationRemoteId criterion visitor
Implemented: LocationId criterion visitor
Impelemente ParentLocationId criterion visitor
Fixed: Location->modifiedSubLocationDate to be of \DateTime in fixture.
Fixed: Incorrect checks for Location->modifiedSubLocationDate.
Fixed: Inteface issue just introduced by CBA.
Default to empty array
Implemented: Basic sorting
Implemented: Sort location depth visitor
Implement addPolicy to role
Fixed: Corrected implementation and test for swapLocation().
Fixed: Behavior of TrashService and tests.
Refactored: Emulation of external field storages in memory stub.

Renamed FieldHandler to PseudoExternalStorage and added quite some docs
to help people understand what is going on.
Added: Todo.
Extend base value object
Implemented Solr facet handling

Only for one single facet yet
Handle facet return values correctly