MDL-42514 groups: Importing groups created unnamed groupings
MDL-42535 report_outline: Notice set_url() was not called
MDL-42536 enrol_self: Added groups/lib.php required file
MDl-42261 My Home: Fixed string key to show all courses
Merge branch 'wip-mdl-42261' of git://github.com/rajeshtaneja/moodle
MDL-31938, MDL-36138 auth_cas: upgrade phpCAS library

Proxy mode changes testing still pending (we don't have such a setup).
MDL-31938: fix syntax error in db upgrade & update plugin version

Also correct language class name.
Merge branch 'MDL-31938-master' of git://github.com/danpoltawski/moodle
Merge branch 'MDL-42219-master' of git://github.com/ankitagarwal/moodle
Merge branch 'MDL-42220-master' of git://github.com/ankitagarwal/moodle
MDL-42207 standardise message text formatting
Merge branch 'w43_MDL-42207_m26_messageformat' of https://github.com/skodak/moodle
Merge branch 'MDL-42535-master-int' of git://github.com/FMCorz/moodle
Merge branch 'MDL-42514-master' of git://github.com/FMCorz/moodle
Merge branch 'wip-mdl-42536' of git://github.com/rajeshtaneja/moodle
on-demand release 2.6beta+
MDL-42489 backup: use correct exception class in automated backups