MDL-44299 resolve collision with session_gc() in PHP 5.6
MDL-44339 treat unexpected debugging() calls in phpunit tests as errors
MDL-44604 fix task cleanup in plugin uninstallation
MDL-44432 use new task scheduler in new logging plugins
MDL-44500 detect context-courseid inconsistencies in new events
MDL-44603 add support for external service autoloading
MDL-44603 fix core_grading_external class and test location
MDL-44603 bump version to update web services
Merge branch 'w11_MDL-44299_m27_sessiongc' of https://github.com/skodak/moodle
MDL-44300 force PHP 5.6.x to return raw file names for our own guessing
Merge branch 'MDL-44608-master' of git://github.com/damyon/moodle
MDL-44635 discard error logging during ajax tests
MDL-44603 fix incorrect hint for grades related class location

Thanks Marina!
Merge branch 'w12_MDL-44432_m27_logcron' of git://github.com/skodak/moodle
Merge branch 'w12_MDL-44339_m27_testdebug' of git://github.com/skodak/moodle
Merge branch 'w12_MDL-44635_m27_ajaxlogs' of git://github.com/skodak/moodle
Merge branch 'w12_MDL-44500_m27_eventcourse' of git://github.com/skodak/moodle
Merge branch 'w12_MDL-44603_m27_extgrade2' of git://github.com/skodak/moodle
MDL-43842: Import atto back into core
MDL-43842 Atto: Move pix-icons into core pix folder.