- version update to 3.5.21
* fix bug in legends
* add extra table info in spanning error case
* Preliminary MultiCol implementation
* fix missing xrange import
* allow rgb to have fractions of 1 in css colors
* fix bug with a tag href not having a scheme
* all0w LineChart/LinePlot area fills to differe from the stroke colour
* add canvas setProducer method
* more FrameBG changes vs BalancedColumns
* fix bb issues #176/#177 reported by graingert & droidzone
* more FrameBG fixes; added canvas cross method, frame static drawBoundary
* fix stroking for frame background in container
* add stroking for frame background
* added axes tickStrokeWidth etc etc
* added rl_setting.reserveTTFNotdef inspired by e3office at bitbucket (pr #50)