[elephant-devel] Migrate->Backup patch

[Leslie P. Polzer]

Attached patch adds, as promised, backup capabilities to the migration code.
In fact it bases the whole thing on a backup/copy concept and only provides
special switches and a compatibility generic function MIGRATE.

In addition, it checks for a btree OID key being NIL. Don't know how
that got into my btrees, but this shouldn't abort the whole operation
in any case.

Please test it on your machines, too, so we can apply it.

  Leslie
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