Function: lfunmul
Section: l_functions
C-Name: lfunmul
Prototype: GGb
Help: lfunmul(L1,L2): creates the Ldata structure (without
  initialization) corresponding to the product of the Dirichlet series
  given by L1 and L2.
Doc: creates the \kbd{Ldata} structure (without initialization) corresponding
  to the product of the Dirichlet series given by \kbd{L1} and
  \kbd{L2}.
