Continue transactions after errors in psql

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Attached is a patch that takes advantage of savepoints to enable
transactions to continue even after errors in psql. The name of it
is \reseterror, and it is off by default. It's backwards compatible,
and allows things like this to work on 8.0 and up servers:

\reseterror
BEGIN;
DELETE FROM foobar;
INSERT INTO foobar(a) VALUES(1);
ISNER INTO foobar(a) VALUES(2);
INSERT INTO foobar(a) VALUES(3);
COMMIT;

Doing a SELECT(a) FROM foobar will show two values, 1 and 3. This
is a great help for those of us that tend to type typos into our
psql session, and end up cursing as we have to restart our current
transaction. :)

- --
Greg Sabino Mullane greg@turnstep.com
PGP Key: 0x14964AC8 200501252203
http://biglumber.com/x/web?pk=2529DF6AB8F79407E94445B4BC9B906714964AC8
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