MWrapXParticles CoordinateList.l,NumPoints.l ; Bring particles in from left/right edges (Not Ptr.l)

Does the same as MWrapParticles except that only the X.w or X.q component of each
particle is wrapped. This means that if a particle goes off the left or right edge
of the bitmap or clip window, it will be horizontally wrapped around. Note that
there is no routine for Ptr.l particles.