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 method to remove a previously added Sti detector/volume
StiDetectorBuilder: Modified detector accessor to handle invalid detector requests in somewhat more graceful way
Uniform improvements in Sti objects output streamers
Remove unused variables
Added new data member to keep track of track energy losses in the node