[Seaside] [FIX] continuations

[Avi Bryant]

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Attached is a fix to a long standing problem with the implementation of
continuations in Seaside (triggering the bug is pretty easy - try, in a
Seaside component, the code "#(1 2 3) do: [:i | self inform: i
asString]").  The problem was that when the stack was copied,
references in temps to stack frames (ie, to BlockContexts) still
pointed to the old copies.  This changeset makes sure that all such
references are updated during the copying.

This also partially cleans up the conflict between continuations and
ensure:, although it is still dangerous, unfortunately, to mix ensure: and
the back button.


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