Implemented persistence of DB relation names.
Implemented general relation operations in DB list, DB set and DB ref.
Restructured DB relation-based collection to enable tracking of changes.
Implemented tracking of changes in DB relation-based containers.
Implemented propagation of the holder in the relation-based containers.
Added support for custom DB serializer, moved Jackson serializer out of InMem.
Implemented full text search in InMem DB.
Fixed the initialization of the holder of relation-based containers.