[sugar] Panorama Activity

[Benjamin M. Schwartz]

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A Panorama-creation Activity is available at

http://dev.laptop.org/~bemasc/PanoramaActivity-1.xo

This is TECHNOLOGY DEMO.  It is not meant to be widely distributed.  It is
definitely not anywhere near a state that would be useful or appropriate for
children.  It is meant primarily as a demo for the Record developers.

This activity generates stitched panoramas, for example

http://dev.laptop.org/~bemasc/panotest.jpg
(This panorama was stitched from 4 frames, and suffers from several known bugs)

To test it:
1. yum install python-imaging
2. Start Panorama
3. Add photos in succession

Known issues:
Images can only be added in a clockwise order
There is an enormous lag between taking pictures and having them appear on the
screen, and the frequency of updates is low.
- --Fixing this requires someone who knows their way around gstreamer-v4l2. It
doesn't seem to be a problem in Record.
The gamekey mappings don't work because the Toolbar retains focus.
The auto-gain and auto-white-balance results in each frame having a hugely
different brightness and color balance.
- --This should be fixed by switching to Bayer mode, once it is solid, because
Bayer mode has no automatic adjustments.
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