Changes in:

Changes in:
   - Saving temp data to fs, instead of db
     (mysql limit bug OUT)
   - Modified clean directories (moodle standard delete dir
     function seems to work wrong with large dirs
   - Send info to browser continuosly to avoid timeouts.
   - Increase php execution time limit
   - More checks.
   - Restore into existing course now works fine
   - Create course_dir if it doesn't exist in the final step
     of backup.