This patch adds lots of webservices to the assignment module.
* mod_assign_revert_submissions_to_draft
* mod_assign_lock_submissions
* mod_assign_unlock_submissions
* mod_assign_save_submission
* mod_assign_submit_for_grading
* mod_assign_save_grade
* mod_assign_save_user_extensions
* mod_assign_reveal_identities
* mod_assign_copy_previous_attempt
All features such as reopening attempts and marking workflow are supported through
the save_grade and save_submission functions.
Uploading files is supported by sending draft item ids for the files_filemanager param the same functions.
When group submissions and blind marking are enabled, an error is thrown
when a teacher trys to download all submissions in a zip. The fix is to
move the url rewriting from the plugin to the assign class so it is
done in a standard way by all modules. The rewriting is done to make images
in a text editor field resolve correctly.
This was preventing the view full submission/feedback link from appearing
everywhere in the assignment when the submission/feedback content had been
truncated in the summary because it was too long (or too many files)
