Fix typo, StiSsdDetectorGroup ==> StiSsdDetectorGroup
Moved MyClear() to beginning of Make() to allow for access of StiTracks by other makers
Added new data members:

- to keep track of track energy losses in the node. Returned value is in GeV
- to keep track of the relative radiation length in the node
- to keep track of the track length in the node
Fix typo, StiSsdDetectorGroup ==> StiSsdDetectorGroup
Merge commit '96551740' into ss
Merge branch 'cvs' into ss