speed-up TVector3::Unit (see ROOT-5302)
speed-up TVector3::Unit (see ROOT-5302)

tc3t/qoot,Dr15Jones/root,tc3t/qoot,Dr15Jones/root,Dr15Jones/root,kirbyherm/root-r-tools,tc3t/qoot,tc3t/qoot,Dr15Jones/root,kirbyherm/root-r-tools,kirbyherm/root-r-tools,kirbyherm/root-r-tools,tc3t/qoot,Dr15Jones/root,Dr15Jones/root,kirbyherm/root-r-tools,Dr15Jones/root,tc3t/qoot,kirbyherm/root-r-tools,tc3t/qoot,tc3t/qoot,kirbyherm/root-r-tools,tc3t/qoot,tc3t/qoot