iss1757 - Interleave extractors and filters #3646

Job	Run time
test (8.4, main, pgsql, GCL, false)	45m 34s
test (8.2, MOODLE_500_STABLE, pgsql, SBCL, false)	18m 56s
test (8.2, MOODLE_405_STABLE, mariadb, GCL, false)	52m 56s
test (8.1, MOODLE_402_STABLE, pgsql, GCL, true)	29m 35s
test (8.4, MOODLE_502_STABLE, pgsql, SBCL, true)	35m 25s
	3h 2m 26s

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