add multiColorDots2 to be used for RT130 Backup volt channel

closes #150 (closed)

Change plotType for Backup volt:

UPDATE Parameters SET valueColorsB='3:R|3.3:Y|=3.3:G' , valueColorsW='3:R|3.3:Y|=3.3:G', plotType='multiColorDotsEqualOnLowerBound' WHERE param='Backup volt';
UPDATE Parameters SET plotType='multiColorDotsEqualOnUpperBound' WHERE plotType='multiColorDots';