FUNCTION: LieTools/WeylWordSign
USAGE:  WeylWordSign(ww);
SYNOPSIS: WeylWordSign(ww) gives the value of the determinant
  of the corresponding Weyl group element (which happens
  to simply be +-1 depending on whether the word consists
  of an even or odd number of reflections with respect to
  root directions.
CAVEATS: requires a previously initialized global Lie algebra environment.
  (See LieTools[gSetup].)
EXAMPLE: 

SEE ALSO: 
