Function classes.

Classes
class	TF1
	1-Dim function class More...
class	TF12
	A projection of a TF2 along X or Y. More...
class	TF1Convolution
	Class wrapping convolution of two functions. More...
class	TF1NormSum
	Class adding two functions: c1*f1+c2*f2. More...
class	TF2
	A 2-Dim function with parameters. More...
class	TF3
	A 3-Dim function with parameters. More...