This patch improves the behavior of FOUND in PL/PgSQL. In Oracle,

This patch improves the behavior of FOUND in PL/PgSQL. In Oracle,
FOUND is set whenever a SELECT INTO returns > 0 rows, *or* when an
INSERT, UPDATE, or DELETE affects > 0 rows. We implemented the first
part of this behavior, but not the second.

I also improved the documentation on the various situations in which
FOUND can be set (excluding inside FOR loops, which I still need to
think about), and added some regression tests for this behavior.

Neil Conway