Create notebooks from fit, add jsroot integration

documentation/doxygen/converttonotebook.py

documentation/doxygen/notebook.gif

tutorials/fit/FittingDemo.C

tutorials/fit/Ifit.C

tutorials/fit/NumericalMinimization.C

tutorials/fit/TestBinomial.C

tutorials/fit/TwoHistoFit2D.C

tutorials/fit/combinedFit.C

tutorials/fit/exampleFit3D.C

tutorials/fit/fit2.C

tutorials/fit/fit2a.C

tutorials/fit/fit2d.C

tutorials/fit/fit2dHist.C

tutorials/fit/fitCircle.C

tutorials/fit/fitConvolution.C

tutorials/fit/fitExclude.C

tutorials/fit/fitLinear.C

tutorials/fit/fitLinear2.C

tutorials/fit/fitLinearRobust.C

tutorials/fit/fitMultiGraph.C