code: def color(requestContext, seriesList, theColor):
      
      for series in seriesList:
          series.color = theColor
      return seriesList
docs: Assigns the given color to the seriesList
  
      Example::
  
          &target=color(collectd.hostname.cpu.0.user, 'green')
          &target=color(collectd.hostname.cpu.0.system, 'ff0000')
          &target=color(collectd.hostname.cpu.0.idle, 'gray')
          &target=color(collectd.hostname.cpu.0.idle, '6464ffaa')