FUNCTION: LieTools/fwgtIWeylOrbit
USAGE: fwgtIWeylOrbit(fwgt);
SYNOPSIS: fwgtIWeylOrbit(fwgt) returns weights in the orbit of fwgt
  under the action of the Weyl group generated by integral roots.
CAVEATS: requires a previously initialized global Lie algebra environment.
  (See LieTools[gSetup].)
EXAMPLE: 
> LieTools[gSetup](G,2):
Setting up Gtype = G   rnk = 2
> LieTools[fwgtIWeylOrbit]([-1/2,-1/2]);
  integral roots = {3, 5}
  Worbit swgts = {[-5/2, -3/2], [-1/2, 1/2], [5/2, 3/2], [1/2, -1/2]}

         {[-1/2, -1/2], [5/2, -3/2], [-5/2, 3/2], [1/2, 1/2]}

SEE ALSO: LieTools[FMultImax]
