Function: lfunmfpeters
Section: l_functions
C-Name: lfunmfpeters
Prototype: Gb
Help: lfunmfpeters(L): L corresponding to a normalized
 eigenform but NOT to the output of lfunsymsq, returns the Petersson
 square of the form, computed using the symmetric square.
Doc: \kbd{L} corresponding to a normalized eigenform but {\bf not}
 to the output of \kbd{lfunsymsq}, returns the Petersson square of the
 form, computed using the symmetric square.
 \bprog
 ? e = ellinit([-2,1]);
 ? L = lfuncreate(e);
 ? lfunmfpeters(L) * (2*Pi)^2 / e.area
 %2 = 0.99999999999999999999999999999999999999
 @eprog
