function for building a legend in OPC plots
crucial graphics subfunction
OPC_Legend( binColors = c(1:8), binNumber = 8, maskDiscard = F, textCol = "black", size = 1, lineCol = "black" )
binColors | 
 number sequence for bins and their colors  | 
binNumber | 
 numeric number of different bins  | 
maskDiscard | 
 logical determining whether faces will be blacked out because they are discarded  | 
textCol | 
 color for the text in the circle legend  | 
size | 
 scaling factor for the legend size  | 
lineCol | 
 color for the lines in the legend OPC_Legend()  | 
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