MDL-42184 bootstrapbase: popup should have no header
MDL-42774 JavaScript: Ensure that shifter cleans build directories before running
MDL-42100 tool_capability: fixed incorrect links
MDL-41316 tool_spamcleaner: Fix sql queries

AS keyword is not allowed in sql qeries for table alias as Oracle doesn't support it
Thanks to Sara Cenni for suggesting the patch
MDL-42884 core_user: fixed issue when deleting users with invalid emails throws invalidusername exception
MDL-42553 core_calendar: third party calendar types can now be uninstalled
MDL-42905 Backup progress: Pointless line of code should be deleted
MDL-42582 Availability: Restriction display incorrect for multi-para Labels

When a label has multiple paragraphs, its name (converted to plain text)
contains a line feed. Due to an error in regular expressions that don't
accept the line feed, this caused incorrect display on the course page
when that label is shown as a requirement for accessing another activity.
MDL-42504 quiz autosave: alert users if connection lost.

When the auto-save fails, we alert the user that they may have lost their
internet connection so that they don't do more work that they might just
lose.
MDL-42863 make capabilities overview more fault-tolerant.
MDL-42865 Make XMLDB foreign key check more robust.

Otherwise, installing one bad add-on can completely break this report.
MDL-42880 quiz settings: remove unnecessary disabledif rules.

These rules were causing problems in the case where the form was
sumitted with validation errors. In that case, the During the attempt ->
The attempt checkbox was becoming unset, and hence the other During the
attmept checkboxes became disabled, and the values were not saved.

Thanks to Sam Marshall for suggesting this fix.
MDL-42181 quiz nav: highight all buttons when all Qs on one page
MDL-42929 backup: keep own version & release updated.
MDL-42852 lib: Blocks disappear in Clean in RTL.
MDL-40223 SCORM: update scorm->launch param after restore - also check that scorm->launch is valid.
MDL-41695 SCORM: allow unlimited decimal places in CMIDecimal
MDL-42060 block_course_list: fixed sorting of mycourses
MDL-42850 administration: Updated bulk user upload errors to be more descriptive.
MDL-42930 Add 2.6.0 upgrade line