MGrabParticlesAndPlotQ CoordinateList.l,NumPoints.l,Buffer.l[,Colour.b];Grabs points X.q,Y.q to buffer & plots

Does the same as MGrabParticlesAndPlot, except using X.q,Y.q list data. Each list
item is a longword quick value in which the upper word is taken as the integer
coordinate and the lower word, the decimal, is ignored. Two longwords are
required for each pixel in the list.