Merge branch 'install_26_STABLE' of git://git.moodle.org/moodle-install into MOODLE_26_STABLE
weekly release 2.6.1+
MDL-41248 completion: fix non-translatable text.

There were two hard-coded strings. Thanks to Guido Hornig for the suggested fix.
MDL-44278 Quiz time overrides: use the same step everywhere.

On the main form, you could select to the nearest minute. On
the override form you could only select to the nearest 5 minutes.
MDL-44287 glossary: do not output before redirecting
MDL-44287 glossary: fixing warnings when importing as new module
MDL-44258 Behat test for workshop, automate MDLQA-99
MDL-44362 recentactivity: fix regressions from MDL-44055
MDL-44377 dml: enforce non-empty prefix for sqlsrv

Only MySQL is allowed to run Moodle instances without
(with an empty) database prefix. The rationale is that
"user" is a reserved word in every RDBMS but MySQL.

Before this patch, installation was breaking badly, when
the "user" CREATE TABLE statement was issued. With this
patch the error is shown earlier (on connection) preventing
any advance/use of the database.

This check is present in all the drivers, just sqlsrv was missing it.
MDL-43852 Filters Fixed naked-OR conditions.
Automatically generated installer lang files
MDL-44074 theme_bootstrapbase: No 768px-979px & 1200px+ empty blk span calcs.
Merge branch 'w06_MDL-43344_m26_flow' of https://github.com/skodak/moodle into MOODLE_26_STABLE
MDL-43916 - Email addresses incorrectly displayed

When capabilities and settings do not allow it.
MDL-43656 mod_feedback: availablity date logic incorrect
MDL-44082 mod_chat: added a security check for users already in the chat activity
Merge branch 'wip-MDL-44362-m26' of git://github.com/marinaglancy/moodle into MOODLE_26_STABLE
MDL-39990 wiki: more detailed validation of view/edit access
Merge branch 'MDL-44377_26' of https://github.com/stronk7/moodle into MOODLE_26_STABLE
MDL-43635: Further support custom contexts: reading from config DB table and reset method for after plugin install
Add PHPUnit test for custom context changes