Add a new function:

Double_t TCutG::Integral(TH2 *h, Option_t *option) const
   // Compute the integral of 2-d histogram h for all bins inside the cut
   // if option "width" is specified, the integral is the sum of
   // the bin contents multiplied by the bin width in x and in y.


git-svn-id: http://root.cern.ch/svn/root/trunk@9329 27541ba8-7e3a-0410-8455-c3a389f83636