Pg Tinderbox Now Checks Schema

[Max Kanat-Alexander]

	As most of you know, we have two tinderboxen that make sure
that checksetup.pl can upgrade safely from any version of Bugzilla to
the latest tip code: one for MySQL, and one for Pg.

	The MySQL tinderbox, after doing an upgrade, checks that the
upgraded schema is identical to a schema created in an empty DB. That
is, that new installs and fully upgraded installs have identical
schemas.

	As of today, the Pg tinderbox also does this. This may expose
some bugs that we were not aware of, and it should also help prevent
bugs in upgrades, in the future.

	-Max
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