Switched default to non-ideal positioning of PXL volumes (currently this affects active layers only). The change assumes that the user runs StPxlDbMaker to create the dataset with appropriate transformations
StiDetectorBuilder: Added a method to save Sti geometry into a root file. The conversion to drawable objects is done by means of StiMaker/StiDetectorVolume class
StiXXXDetectorBuilder: Save Sti detector geometries as drawable objects in root files when 'debug2' option is specified in BFC chain