MReboundParticlesQ CoordinateList.l,NumPoints.l,DiectionList.l,DetectSize.w ; Bounce particles off edges

Does the same as MReboundParticles except that the coordinate table is a list of
X.q,Y.q data and the movement table is a list of Xmove.q,Ymove.q movement adders.
The .q quick data are pairs of longwords, the upper word of each being taken as
the integer coordinate. Note that the whole of the movement variables will be
negated, not just their upper words.