Fixed error [#METR-21877].

Added more test [#METR-21877].

Added more test [#METR-21877].

Better [#METR-21863].

More tests [#METR-21863].

Fixed error in release script [#TESTIRT-9529].

Fixed error in release script [#TESTIRT-9529].

Addition to prev. revision [#METR-2944].

Site: added link to tutorial [#METR-20000].

Added test [#METR-2944].