various fixes/improvements, activate execution of expensive tests as … #8

Job	Run time
define-matrix	5s
test (8.3, main, pgsql, true)	3m 8s
test (8.3, main, mariadb, true)	3m 31s
test (8.2, MOODLE_404_STABLE, pgsql, false)	3m 15s
test (8.2, MOODLE_404_STABLE, mariadb, false)	3m 22s
test (8.3, MOODLE_404_STABLE, pgsql, false)	3m 11s
test (8.3, MOODLE_404_STABLE, mariadb, false)	3m 13s
test (8.2, MOODLE_405_STABLE, pgsql, false)	3m 14s
test (8.2, MOODLE_405_STABLE, mariadb, false)	3m 29s
test (8.3, MOODLE_405_STABLE, pgsql, false)	3m 26s
test (8.3, MOODLE_405_STABLE, mariadb, false)	3m 28s
	33m 22s

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