FUNCTION: LieTools/PBWSymMap
USAGE: PBWSymMap(gpoly);
SYNOPSIS: PBWSymMap(gpoly) yields the Poincare-Birchoff-Witt expansion
  of the image in U(g) of an polynomial gpoly in S(g) via the symmetrizer
  map.
CAVEATS: requires a previously initialized global Lie algebra environment.
  (See LieTools[gSetup].)
EXAMPLE: 

SEE ALSO: LieTools[SymMap], LieTools[NormalOrder]
