[ROOT] new TFormula features

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Hi,

The CVS repository has been updated with a few improvements to TFormula (and
thus to TF1 and TTreeFormula).

TFormula::Compile has been updated to be calleable a 2nd time (i.e. properly
clear the data members).

TFormula has been upgraded to be able to understand and call any global
functions or static data member functions that returns a numerical value and
takes numerical arguments.

For example you can now do (because TMath::BreitWigner is a static member
function):

	TF1 *f = new TF1("f","x*TMath::BreitWigner(x,[0],[1])");

Cheers,
Philippe.

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