Hit assoc fix 70 x

Here I'm trying to port this change into 7_0_X.  I started with CMSSW_7_1_0_pre1; maybe that's why the comparison shows so many commits?
This change is to restore the hit residuals in relMon that were broken at CMSSW_6_2_0_pre8 as a side effect of the revised tracking particles. A branch in the code that was already in place for pixels is now executed for the strips as well. This branch doesn't depend on the (broken) crossing-frame pointers of the digiSimLinks. Modified files:
SimTracker / TrackerHitAssociation / interface / TrackerHitAssociator.h
SimTracker / TrackerHitAssociation / src / TrackerHitAssociator.cc