Speed up FT cluster lookups
Using the clusters on the track, now the FT clusters are not searched for in the location of all clusters, but instead the track itself. This should make running the TMF on T tracks a bit quicker.
In addition, I changed the PrFTHits to contain the cluster itself instead of the channel. The PrKF now passes the track's FT cluster container as a place to search first for clusters.
Edited by Laurent Dufour