is not a multiple of the grouped bins. In this case the upper edge
  of the rebinned histogram is recomputed. Last bin(s) are added to the overflow bin
  and the statistics are reset. (thanks Gerco Underwater for the suggestion).


git-svn-id: http://root.cern.ch/svn/root/trunk@68 27541ba8-7e3a-0410-8455-c3a389f83636