[update 1.2] #12293

12293
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Issue 3511: Possibility to register own help in system help
Issue 3510: HistoryNode problem with two consecutives closeGroup
Issue 3508: cleanUpForProduction should really unload Graphics-Resources
Issue 3507: SUnitUnloader >> unloadTestPackages is wrong and outdated
Issue 3485: VMMaker does not load on Pharo 1.2


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Marcus Denker  -- http://www.marcusdenker.de
INRIA Lille -- Nord Europe. Team RMoD.