Refactored the build to use a <path> element for the classpath rather
than ant properties. This makes the classpath easier to manage, but required
changes throughout the build. I think everything should still build fine --
it works for me.
Upgraded the JDBC driver for postgres to the version 8 driver.
Fixed problems with the postgres SQL scripts that were preventing them
from being run from ant. Works for me now, but looks like the oracle
scripts might be missing a few tables from its drop list.