Merge branch 'MDL-42587_25' of git://github.com/aolley/moodle into MOODLE_25_STABLE
MDL-42517 testing Changed events test to use assertDebuggingCalled()
MDL-42566 mod_data: introduced check to ensure the picture supplied is valid
MDL-33536 navigation: hide hidden categories from the navbar
Merge branch 'MDL-40971_M25' of git://github.com/lazydaisy/moodle into MOODLE_25_STABLE
MDL-42617 Add support for frozen fields in searchableselector form elements
Merge branch 'MDL-41624_25' of git://github.com/jmvedrine/moodle into MOODLE_25_STABLE
MDL-42619 block_community: delete course redirect bug fix
MDL-42286 questionbank: add behat tests for putting questions in categories MDLQA-95
MDL-28463 conditionlib: 10 minutes lifetime of cached grades
Merge branch 'install_25_STABLE' of git://git.moodle.org/moodle-install into MOODLE_25_STABLE
weekly release 2.5.2+
MDL-42664 Fix the filter_manager instantiation

For legacy reasons, the $CFG->perfdebug uses values 7 for disabled and 15 for
enabled. Because of this typo, Moodle has always created instance of the slower
performance_measuring_filter_manager instead of the standard filter_manager,
regardless the perfdebug setting.
MDL-42429 mod_lesson: removed unnecessary conditional check
MDL-42663 mod_lesson: Move definitions to show_clock()

Seems that the required data is not always set
before timer.js is included.
Merge branch 'MDL-42287-25' of git://github.com/ankitagarwal/moodle into MOODLE_25_STABLE
MDL-42496 backport MDL-41245 add-on install request redirection fix
MDL-42044 standardise list of unzipped files in add-on installer
Merge branch 'wip-MDL-28463-m25' of git://github.com/marinaglancy/moodle into MOODLE_25_STABLE
MDL-42648 lib: Clean theme throws exception if set_pagelayout is called too late.