From Gilles Quemener (quemener@lpsc.in2p3.fr):

Add two new features:
 -possibility to set the number of bins of some histograms
   SetBinVarX(Int_t nbbinvarx) {fBinVarX = nbbinvarx;}
   SetBinVarY(Int_t nbbinvary) {fBinVarY = nbbinvary;}
 -New function
   EvalError(const Double_t *x, const Double_t *coeff)
 to evaluate the error on the parametrisation at point x


git-svn-id: http://root.cern.ch/svn/root/trunk@16310 27541ba8-7e3a-0410-8455-c3a389f83636