Automatically generated installer lang files
MDL-46647 grades: Fix fetch_all_helper() towards cross-db

That helper, used to fetch information from DB by all the grade_object
chidren classes was not behaving properly handling TEXT/CLOB columns.

Instead of creating a property within every class listing the
existing columns, it seems to be a better solution to instrospect
the database metadata (cached) to ensure the correct SQL is generated
in every case.
MDL-46647 core_grades: Adding tests for fetch_all_helper()
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Merge branch 'MDL-46647-27' of git://github.com/FMCorz/moodle into MOODLE_27_STABLE
MDL-47497 qformat_gift: fix bad backported behat test
Automatically generated installer lang files
Merge branch 'install_27_STABLE' of https://git.in.moodle.com/amosbot/moodle-install into MOODLE_27_STABLE
weekly release 2.7.2+
MDL-40351 cachestore_mongo: fixed unit test error

If you configured your site to run mongo unit tests and had
the mongo extension and backend installed but did not have the
mongo service running you would get a fatal error when running
the unit tests.
That problem has been fixed by checking the mongo test instance
is ready before returning it.