add in FitResult the methods ParError to avaoid conflic observed in TFitResult with TObject::Error.
This fixes problem reported at https://savannah.cern.ch/bugs/index.php?67671.
Add also a Parameter and ParName methods to have consistent API.
Update documentation of TH1::Fit and TGraph::Fit to use the new methods
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trunk/hist/hist/src/TGraph.cxx