Restore frozen xids for binary upgrades

Bruce Momjian wrote:

The attached patch adds to pg_dumpall --binary-upgrade by restoring
information about frozen xids for relations and databases. I think this
is the last patch I need to complete my TODO items for the pg_migrator
binary upgrade utility.

Applied.

--
Bruce Momjian <bruce@momjian.us> http://momjian.us
EnterpriseDB http://enterprisedb.com

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