Re: MultiXact truncation, startup et al.

New versions of all these patches, plus one more patch which removes the
behavior that HeapTupleGetUpdateXid checks for aborted updates.  (Turns
out this was necessary to get freezing right.)  My previous patch to
avoid InvalidXid as page prune point is reverted in there, too (no
longer necessary.)

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Álvaro Herrera                http://www.2ndQuadrant.com/
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