Now plotting 2d patches

[Sebastien Loisel]

Hi,

I've updated the screenshot

http://www.math.mcgill.ca/loisel/octave-workshop/plot-screenshot.png

The highlight is that I now plot Gouraud shaded 2d patches.

Current features:
* Gouraud shaded line soups.
* Axes with optional title, individual axes and an isometric mode to prevent distortion when the figure is resized (isometric mode not where I want it yet.)
* Gouraud shaded triangle soups (patches).
* Subplot functionality
* Multiple figure windows

Upcoming 2d features:
* Line stipples
* Legend box
* Axis labels

Upcoming 3d features:
* 3d axis system
* 3d Gouraud shaded lines
* 3d Gouraud shaded patches

Upcoming UI features:
* Zooming of 2d and 3d plots
* Rotating 3d plots
* Save to ps/eps/pdf (depending on how well gl2ps works.)

Cheers,

Sébastien Loisel