jsdoc documentation errors

[trych]

Ok, as the semester starts and I tinker with basil again, I start finding lots of mistakes. As I cannot fix all right away, I will just open this issue here, to collect all errors in the documentation that I come across. ;) Please edit the opening post to add any errors that you find.

• b.rotate(): Description seems to have been copied from Processing and does not reflect the basil.js behavior at all (in basil.js rotate does not rotate around the origin, but around the anchor of the object, also rotate is not reset after each draw, as basil.js draw does not loop).
• b.scale(): Same as above.
• b.rectMode(), b.ellipseMode(): All mention configurations like ellipseMode(CENTER) which should be b.ellipseMode(b.CENTER) instead.
• b.Matrix2D and all of its methods are missing any meaningful description of how one is supposed to use them and of what parameters they exactly need.