DISPLAY RGB IMAGE BY FLOYD-ST METHOD
Macro: DISSIMRFS
Function: Colour display of the three image planes containing the R, G and B components by converting the 8x3 bits to 3 R bits, 3 G bits, and 2 B bits and using error-carry (to 3 neighbouring pixels) method of floyd-steinberg.
Parameters: 
1. Image plane to be displayed.

