Further work on Moodle integration.

Further work on Moodle integration.

Updated PaintWeb to the latest snapshot.

Loading, editing and saving of images with PaintWeb works now. Image save has
two modes: save using data URLs or using files.

Work remaining:
- when images are saved using data URLs I need to make them work in IE 6/7.
- need some cronjob to cleanup/remove unused images saved in the data dir.

2009-07-30:
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- Completed work on the "Create image" functionality in the TinyMCE plugin.
- Worked around the security violation caused by rendering of images with data
URLs in Webkit/Gecko 1.9.0.
- A bit of improved browser detection in the PaintWeb lib.
- Fixed image saving as JPEG in Firefox.

2009-07-29:
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- Implemented better support for the background color configuration option. Now
PaintWeb makes it more obvious when an image has true transparency and when not.
- Fixed the eraser tool to properly erase the image pixels, irrespective of the
background color.
- New icon for the PaintWeb button from the TinyMCE plugin.
- Implemented support for creating new images from the TinyMCE plugin. New
images use data URLs. (still needs bug fixing / testing)