MDL-45514 behat: Fixed should_not_exist timout param
MDL-41383 theme: filepicker zoom resiliency

Fixed an issue that broke the file picker on bootstrapbase when zooming in and out.
MDL-45522 quiz Check that sumgrade is valid before saving.
MDL-45523 quiz Cleanup duplicate question instances.
Merge branch 'MDL-45522_m27' of https://github.com/merrill-oakland/moodle into MOODLE_27_STABLE
Merge branch 'MDL-45523_m27' of https://github.com/merrill-oakland/moodle into MOODLE_27_STABLE
Merge branch 'MDL-41383-27' of git://github.com/jethac/moodle into MOODLE_27_STABLE
MDL-41383 theme: filepicker zoom resiliency (base)

Fixed an issue that broke the file picker on base when initial zoom level is less than 100%.
MDL-36670 logging: action parameter length restricted to 40 chars
MDL-41383: RTL fix for base when zoomed out
MDL-41383 Filepicker: whitespace fix
weekly release 2.7+
MDL-45333 output: navbar is now wrapped in a <nav> tag