


plots projection test between two clusters clNr1 and clNr2
mode: 1=plot everything (6 subplots)
2=plot only one subplot and do not issue any subplot commands
3=no plotting (only calculation)
colors: two string values, eg {'r','b'} for the color of the histogram
bug: in R14,this color values somehow don't work and need to be specificed directly with
set(h,'FaceColor',....),with h returned from bar (see below).
urut/dec04