N-D parametric functions

Multi-dimensional parametric functions.

Classes
class	ROOT::Math::ParamFunctionBase< T >
	class defining the signature for multi-dim parametric functions More...
class	ROOT::Math::ParamFunctorHandler< ParentFunctor, Func >
	ParamFunctor Handler class is responsible for wrapping any other functor and pointer to free C functions. More...
class	ROOT::Math::ParamMemFunHandler< ParentFunctor, PointerToObj, PointerToMemFn >
	ParamFunctor Handler to Wrap pointers to member functions. More...