Function: lfunmul
Section: l_functions
C-Name: lfunmul
Prototype: GGp
Help: lfunmul(ldata1,ldata2): creates the ldata structure (without
  initialization) corresponding to the product of the Dirichlet series
  given by ldata1 and ldata2.
Doc: creates the ldata structure (without initialization) corresponding
  to the product of the Dirichlet series given by \kbd{ldata1} and
  \kbd{ldata2}.
