Regression tests

I've started going through the regression tests and updating for the
new psql output. The first few tests have been committed, and I'll try
working through the others in the next few days.

I've also updated the test queries to use the extended SQL92 type
coersion syntax rather than the older, non-standard Postgres "::"
notation. I'll still keep some "::" queries somewhere so that the
syntax continues to be tested...
                   - Thomas

-- 
Thomas Lockhart                lockhart@alumni.caltech.edu
South Pasadena, California