Worked on image save as a file in Moodle.

Worked on image save as a file in Moodle.

Updated PaintWeb to the latest snapshot:

- Continued work on image save into Moodle. This time worked on refining the
implementation of image save as a file.

- Fixes/improvements to the server-side script imagesave.php. Now the script
determines if an image comes from a course and updates it accordingly - if
permissions allow it. If the image cannot be found/updated, then a new image is
saved in the PaintWeb images folder inside the data dir.

- Implemented support for image file types in the PaintWeb.imageSave() method.
All browsers support the PNG format. Currently only Firefox 3.5 and Opera 10 can
also save JPEG images.

- When an image from a course is updated, PaintWeb tries to maintain the same
file format: PNG or JPEG. If the format cannot be maintained, then a new PNG
image is created in the PaintWeb images folder from the data dir.

- TinyMCE plugin improvements. Made it behave better with regards to image
updates/saves. For example the image src attribute is only updated when PaintWeb
is closed.

- New config option for image save quality (for JPEGs).
- New config option for "moodleSaveMethod". Now users/devs can easily switch the
PaintWeb Moodle extension to save images as data URLs or as files, depending on
their likings.

- Updated ext/moodle/imageview.php to better integrate into Moodle.

- Updates for English strings.