Fully qualify enums in Tr/TrackFitEvent and improve searching for TT Hits
In addition, make less assumptions on the return type of fitNodes()
Improved searching for TT hits: instead of looping over all hits, and remembering the first and last TT hit seen, search forward for the first one, and only when something is found, search backward for the last one... (this requires less state)
Edited by Marco Cattaneo