qbrush
Set brush for QPlot
Help text:
   qbrush id | color | 'none' | opacity  chooses or changes a brush for
   QPlot. ID must be a single capital letter. COLOR may be a named color
   (i.e., one of krgbcmyw), or a 3-digit or a 6-digit string. 
   OPACITY must be a number between 0 and 1.
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