Merge branch 'MDL-43773-master' of https://github.com/lucisgit/moodle
Merge branch 'wip-mdl-43766' of https://github.com/rajeshtaneja/moodle
Merge branch 'wip-mdl-43765' of https://github.com/rajeshtaneja/moodle
Merge branch 'wip-MDL-43643-master' of git://github.com/marinaglancy/moodle
Merge branch 'MDL-43757_master' of git://github.com/dmonllao/moodle
MDL-43797 lib/moodlelib.php: Remove custom homepages on user deletion

Change-Id: Ibaf6f0a9dc29d00b97a32111d1cf5063ebed1888
Merge branch 'MDL-43874' of git://github.com/timhunt/moodle
MDL-43797 lib/db/upgrade.php: Remove custom pages for deleted users

Change-Id: Ifef563431682a2a5524927f85ca9eba9cbe520ff
Merge branch '43688-27' of git://github.com/samhemelryk/moodle

Conflicts:
	theme/bootstrapbase/style/moodle.css
Merge branch 'MDL-43450_master' of git://github.com/dmonllao/moodle
Merge branch 'MDL-43246' of git://github.com/timhunt/moodle
MDL-43797 lib/db/upgrade.php: Optimise sql for my_pages deletion

Change-Id: Idf300ab07afda3bcefea80e617549f40c710e529
Merge branch 'master_MDL-43797' of https://github.com/totara/moodle
MDL-42928 JavaScript: Create a module to handle page scroll locking
MDL-42928 JavaScript: Add LockScroll to all modal dialogues
MDL-42928 JavaScript: Disable lockScroll for small chooserdialogues
MDL-34055 add bulk DB->insert_records() method

This patch was inspired by patch by Simon Coggins from Totara.
MDL-40909 mod_forum: removed duplicated test (duplicated in enrol/meta/tests/plugin_test.php)
MDL-39942: invite only users who can post to discuss
MDL-40909 core_enrol: removed 'unenrol' add_to_log calls

Before each of these calls a call to unenrol_user() is made, which
triggers the event 'user_enrolment_deleted'. Nothing more is needed.