MDL-47655 assign: Fix unit tests triggering debugging

Test was triggering notifications - so needs to use a message sink.
Merge branch 'MDL-47655-master-fix1' of git://github.com/damyon/moodle
MDL-45843 LTI: Fixes for sloppy form handling
Revert "MDL-44548 mod_scorm: force an external sync to check for updated files."

This reverts commit 2d9a4a5f93169207a166d6d7a7426652e2bf83a1.
Merge branch 'MDL-45843-master-fix1' of http://github.com/damyon/moodle
MDL-47733 editor_atto: Do not prompt error when draft is empty
Merge branch 'MDL-47733-master' of git://github.com/FMCorz/moodle
MDL-47739 form: Calendar widget causes unintentional focus and scroll