Various bugfixes

Found while developing the next patch I'll send.  Applied to
both 2.3 
and 3.0.

The most notable ones are: 1) a finalization race, which
teaches you not 
to use finalizable objects in an instance variable, if an
object can be 
resurrected during its own finalizer; 2) moving #pathTo: to
Directory, 
the semantics otherwise were not that clear.

Paolo

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