Add permissions check: now one must be the Postgres superuser or the

table owner in order to vacuum a table.  This is mainly to prevent
denial-of-service attacks via repeated vacuums.  Allow VACUUM to gather
statistics about system relations, except for pg_statistic itself ---
not clear that it's worth the trouble to make that case work cleanly.
Cope with possible tuple size overflow in pg_statistic tuples; I'm
surprised we never realized that could happen.  Hold a couple of locks
a little longer to try to prevent deadlocks between concurrent VACUUMs.
There still seem to be some problems in that last area though :-(

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