MDL-41593 admin: use default setting if preventexecpath active

This resolves problems when installing Moodle
and addons when preventexecpath active.

Please note the admin_setting_configfile is still
incorrectly restricted - this will be resolved by
MDL-40949.
MDL-46133 tool_monitor: added event cleanup task
MDL-46133 tool_monitor: added unit tests
MDL-47728 tool_monitor: added capability check before displaying link
MDL-47739 form: Calendar widget causes unintentional focus and scroll
MDL-47695 quiz editing: descritions don't have a max mark!

So don't show the UI for editing it.

Also, don't show non-functional page split/join icons after the quiz has
been attempted.
MDL-36669 Filters: Remove the last ref to the UFO library.
Merge branch 'MDL-46133_master' of https://github.com/markn86/moodle
Merge branch 'MDL-47695' of git://github.com/timhunt/moodle
Merge branch 'MDL-47739-master' of git://github.com/FMCorz/moodle
Merge branch 'm28_MDL-36669_UFO_references_in_filelib' of https://github.com/scara/moodle
MDL-46133 tool_monitor: version bump for events
MDL-47400 gradereport_history: Fix string notempty test for Oracle
Merge branch 'MDL-47400-master-2' of git://github.com/andrewnicols/moodle
Merge branch 'MDL-47728_master' of git://github.com/markn86/moodle
Merge branch 'wip_MDL-41593_m28_preventexecdefault' of https://github.com/skodak/moodle
MDL-47736 editor_atto: exclude <br> from being restored
Merge branch 'MDL-47736_master_fix' of git://github.com/markn86/moodle
MDL-47736 editor_atto: added fix for IE 9 and 10
Merge branch 'MDL-47736_master_fix2' of git://github.com/markn86/moodle