pg_upgrade ready for testing

OK, I have tested pg_upgrade with 7.1->7.2 and 7.2->7.2 databases, and
it seems to work fine. It is ready for wider testing.

To use pg_upgrade, copy it from CVS to somewhere in your path. Edit the
file and change ENABLE="N" to ENABLE="Y". Then, read pg_upgrade.sgml
for the steps required for its use.

pg_upgrade isn't enabled in the SGML build right now so you have to read
the SGML source at this point.

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