LArReadoutGeometry update

1. Fixed LArReadoutGeometry so that it can work when GeoModel is constructed from the SQLite file. The patches mostly required for finding proper implementation of the IRDBAccessSvc interface at run time.

2. Changed interface of the XXXRegion classes in LArReadoutGeometry by introducing an optional argument - a pointer to GeoAlignStore - to the getAbsoluteTransform() and getDefAbsoluteTransform() methods. This is required for getting correct positions of LAr alignable volumes in an MT environment. Also dropped few duplicate methods in XXXRegion classes, and updated client code in the CaloDetDescr package.