Inverted AA3 matrix calculated correctly.  (TMatrixDSym didn't work)
Fix nplaneshit>6 bug. (fix Count1Bits routine)
Add LinkStubs method to THcDC.  Comment out some debugging.
  Compiles and doesn't crash.
1) In THcDriftChamber::ChooseSingleHit finalnum was not being increased
   for first hit. Added an else branch to increase finalnum
2)  In THcDriftChamber::LeftRight() when using the small angle
    approximation then assignment of sign to the y planes was reversed.
Add fDebugDC in THcDC.h to flag when to write out debug statments.
Set fDebugDC in THcDC::ReadDatabase
Add fDebugDriftCh to THcDriftChamber.h to flag when to write out debug statements
Set fDebugDriftCh in DefineVariables
Put if fDebugDriftCh in front of all cout statements
In THcDriftChamber::DestroyPoorSpacePoints replace line (*fSpacePoints)[isp] = (*fSpacePoints)[osp];
In THcDriftChamber::SelectSpacePoints() replace line (*fSpacePoints)[sp_count] = (*fSpacePoints)[isp];
example with setting the debug flag
Partially implement THcDC::TrackFit, modelled after h_track_fit.
  Uses ROOT matrix math instead of solve_four_by_four
  Nothing is done with found tracks yet.  Will need to stuff these into
     podd style tracks.  (Or a class inherited from podd style tracks.)
  Residuals not saved anywhere
  Single stub mode not yet implemented
  No printing out of trackfit results (hdebugtrackprint)
1) Add flag fDebugDC if set=1 in THcDC::Setup will write out info
1) Modified THcDriftChamber::SpacePointMultiWire
Since we have not yet overwritten the = operator for space points
had to add code to do this.
Merge branch 'mkjdc2' into develop
Updated THcDriftChamber::SpacePointMultiWire
Added debug flag
Updated THcDriftChamber::ChooseSingleHit
Updated THcDriftChamber::SelectSpacePoints
Implement more DC tracking.
   Add track coordinates to track structure.
   Add code for single stubs
   Try to deal with plane number/index confusion
Replace TrackSP structure with THcDCTrack class
Debugging and logic updates from Mark.
Bug fix and debugging message improvements.
Histogram the calculated focal plane ray.
Fix spoint logic and incorrect use of isp2.
Set 2d histogram limits on tracking results.