Fixed: ID mapping required for parent depth limitation.
Merge branch 'sql-ng' of github.com:ezsystems/ezpublish-kernel into sql-ng

Conflicts:
	eZ/Publish/API/Repository/Tests/IdManager/SqlNg.php
SortClause handler for sql ng backend.
Merge branch 'sql-ng' of github.com:ezsystems/ezpublish-kernel into sql-ng