StiDetector: Added splitIt method to split this volume along the radial direction. Also added a missing assignment for StiElossCalculator in copy
StiDetectorBuilder: Added parameters defining the volume splitting procedure and a call to the splitting routine based on these parameters
Auto-segmentation of radially oriented volumes (Victor/Dmitri/Gene)
Merge branch 'ds-vsplit'

Conflicts:
	Sti/StiDetector.cxx
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