MDL-47684 mod: better validation of rating options
MDL-47815 assign: Fix random unit test fails

This test was failing when it was run really slowly (looking at you oracle).
MDL-47817 web services: Fixed check of inexistent constant WS_SERVER
MDL-47675 phpunit: Update unit tests to pass on MSSQL

Unit tests were failing on MSSQL. gc_collect_cycles() was
removed from the phpunit utils.php file to save time in running
the tests, but MSSQL doesn't clean up open files as well as
other databases.

This patch includes the garbage collection for the unit tests
that require it.
MDL-47077 report_participation: fixed pagination in groups
Merge branch 'MDL-47817-26' of git://github.com/jleyva/moodle into MOODLE_26_STABLE
Merge branch 'wip-MDL-47675-26' of git://github.com/abgreeve/moodle into MOODLE_26_STABLE
Merge branch '47684-26' of git://github.com/samhemelryk/moodle into MOODLE_26_STABLE
Merge branch 'MDL-47815-26' of git://github.com/damyon/moodle into MOODLE_26_STABLE