re-enable full lineup (pharo3.0 and all Squeak platforms excluded, because they are failing for reasons that have nothing to do with Metacello ... failures due to hangs - Squeak - or systemic test failures - Pharo3.0 - render running the tests on those platforms meaningless)

don't run GemStone user guide tests, because they're failing because of
load issues with Seaside31 on top of Seaside30 ... the relevant seciton
of userguide needs to be rewritten (Issude #241) ...