change [draw group] to [draw g] to match svg spec name for groups

This changes [draw group] to [draw g] for the new data structure drawings. It's a pretty disruptive change in the interface, but a very easy one to implement. So I wanted to make it before hitting a release candidate, and before too many people begin using data structures.

This way the main [draw] arguments are exactly the same name as their svg counterparts. It's a fairly small usability improvement-- the user can go to the spec or tutorial for SVGs and immediately know that <g> corresponds to [draw g]. Still, I think that consistency is important and helpful, so I wanted to fix it before releasing.

Status changed to merged

It's a fairly small usability improvement

+1 Consistency is key. Right now to really understand the draw commands you need to go to the svg docs, so this change is important. And no need to worry about backward compatibility until you hit the first official release. :)