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 This function  changes expression for the Breit-Wigner propagator
used by CompHEP.  For the case 'S-dependence OFF' the following 
expressions for the scalar part of propagator are substituted:

a)first power propagator         b)squared propagator
    P^2 - Mass^2                           1
 ----------------------------    ------------------------------
(P^2-Mass^2)^2 + (Mass*Width)^2  (P^2-Mass^2)^2 + (Mass*Width)^2

Here P, Mass, Width are the virtual particle Lorentz momentum,
mass and width correspondingly.
  For the case 'S-dependence  ON' CompHEP uses the same
expressions where
                    P^2   
Width -> Width * ---------
                   Mass^2
 Such substitution simulates the hight order correction to
the Breit-Wigner formula.
