Remove unnecessary TMath::Nint() calls to fix compile error

- no need to call Nint() on an integer
Minor memory leak squashing.  (From running valgrind)
Restore default THcDriftChamber constructor.
Ignore .root_hist and vim .swp files
Disable hms track debug info

debug info should be suppressed in the main develop branch
Merge branch 'develop' of github.com:/JeffersonLab/hcana into develop