MDL-41315 assign: Add unit test for groupmembersonly
MDL-29987 File resource: fix problem with PDF display on mobile devices

Setting the default display option for PDF files from DISPLAY_EMBED to DISPLAY_OPEN
MDL-41667 quiz: Fix CSS rules.

Thanks to Renaat Debleu for spotting this problem.
MDL-38194 Files: Allow download of large backup files

The PHP readfile function does not work for files more than 2GB.
This commit provides a wrapper that can be used so that files less
than 2GB are sent with readfile, and files larger than 2GB are
sent manually.

The change applies to all uses of pluginfile.php, although in
reality, backup files are probably the only ones likely to be more
than two gigabytes.
Merge branch 'MOODLE_25_STABLE' into install_25_STABLE
MDL-37524 SCORM: mode not calculated correctly.
Merge branch 'wip-MDL-27684-MOODLE_25_STABLE' of git://github.com/satrun77/moodle into MOODLE_25_STABLE
Merge branch 'm25_MDL-37524' of git://github.com/danmarsden/moodle into MOODLE_25_STABLE
Merge branch 'MDL-41662_25' of https://github.com/totara/openbadges into MOODLE_25_STABLE
Automatically generated installer lang files
Merge branch 'MDL-41637_25' of https://github.com/totara/openbadges into MOODLE_25_STABLE
Merge branch 'MDL-38194-m25' of git://github.com/sammarshallou/moodle into MOODLE_25_STABLE
MDL-40550 badges: Change wording of badge activation message

Add confirmation check when activating badge from management page
Merge branch 'MDL-41315-25' of git://github.com/damyon/moodle into MOODLE_25_STABLE
MDL-38317 grade import: Translation support for import mappings form.
Merge branch 'MDL-38317-moodle25' of git://github.com/StudiUM/moodle into MOODLE_25_STABLE
Merge branch 'MDL-41667_25' of git://github.com/timhunt/moodle into MOODLE_25_STABLE
Merge branch 'MDL-41595_M25' of git://github.com/lazydaisy/moodle into MOODLE_25_STABLE
MDL-41833 feedback: Fix setType() warning when deleting a response in feedback
MDL-41594 Bug fix for orphaned invisible categories

thanks to L.Sanocki