[Nitro] PATCH: Og, Tests

[George Moschovitis]

>   * dont_manage_already_managed_classes
>   Modifies the ObjectSpace selection so that classes already managed aren't
> selected.

you have submitted this patche aerlier but caused problems with the
admin part. (Didn't display any managed classes...) Please be careful
if this new code works.

regards,
George.


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