StiDetector: Removed pointer to StiElossCalculator from the class. The objects of StiElossCalculator are referenced now in StiMaterial
StiMaterial: Associated StiElossCalculator with StiMaterial by adding a new member pointer to the class
Removed any explicit reference to StiElossCalculator in all StiDetectorBuilder's. StiElossCalculator is now a member of StiMaterial where it is created and managed
Removed any explicit reference to StiElossCalculator in all StiDetectorGroup's. StiElossCalculator is now a member of StiMaterial where it is created and managed
Access StiElossCalculator from StiMaterial instead of StiDetector. StiElossCalculator is now a member of StiMaterial where it is created and managed
StiKalmanTrackNode: Corrected Eloss calculation
StiTrackNodeHelper: Corrected Eloss calculation
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
Merge branch 'ds-stimaker-hft-dev' into hft-dev
Merge branch 'ds-sti' into hft-dev