Function: serlaplace
Section: polynomials
C-Name: laplace
Prototype: G
Help: serlaplace(x): replaces the power series sum of a_n*x^n/n! by sum of
 a_n*x^n. For the reverse operation, use serconvol(x,exp(X)).
Doc: $x$ must be a power series with nonnegative
 exponents or a polynomial. If $x=\sum (a_{k}/k!)*X^{k}$ then the result isi
 $\sum a_{k}*X^{k}$.
