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

Does the same as MGrabParticles, at the same time as doing the same as
MPlotParticles. As each particle is grabbed from the currently used chunky
Bitmap, according to the list of X.w,Y.w coordinates listed as pointed to by
CoordinateList.l, pixels in the currently used Ink or the specified Colour will
be plotted to the same coordinates. This facilitates a kind of `buffered plot'
system whereby the background is stored using the grab and then pixels rendered
using the plot. Buffer.l points to the buffer memory to which the background
pixels will be grabbed and NumPoints.l specifies how many points will be handled.
If MParticleMode is set to MSimpleReMapMode or MReMapMode, pixels will be simple
or complex remapped respectively when they are plotted. If MReMapMode is chosen,
the source colour will be taken from the specified colour or ink. In
MSimpleReMapMode the destination pixels will be simple-remapped regardless of
specified or currently used colour.