Add handling of TFormula fParams & fClingParameters
Add handling of TFormula fParams & fClingParameters

This makes the folowing example working

TF1 f1("f1","gaus",0,10);
TF1 f2("f2","10.-x",0,10);
f2.SetParameter(0,1);

f1.SetParameter(0,2);
f1.SetParameter(1,4);
f1.SetParameter(2,2.5);

TF1 f3("f3","f1+f2",0,10);
f3.SetParameter(0,3);
f3.SetParameter(2,0.5);
f3.Draw();

bellenot/jsroot,root-project/jsroot,root-project/jsroot,bellenot/jsroot,linev/jsroot,bellenot/jsroot,linev/jsroot