patch: bring org/postgresql/test/README up to date

Is this the right list for sending JDBC-specific patches or should
they be directed to pgsql-patches(at)postgresql(dot)org?

Anyhow-

Changes

This patch partially brings org/postgresql/test/README up to date.
The document doesn't seem to haved changed much since 2001:
http://archives.postgresql.org/pgsql-jdbc/2001-08/msg00350.php
http://archives.postgresql.org/pgsql-patches/2001-09/msg00000.php
http://archives.postgresql.org/pgsql-jdbc/2001-09/msg00155.php

Since the JDBC driver is no longer part of the main tree in
http://developer.postgresql.org/cvsweb.cgi/pgsql/ I removed all
references to the latter.

I also updated the document to reflect the fact that the tests are
now run via "ant test" rather than "make; make check". I also
updated a couple of paths to files that seem to have been shuffled
around.

Lastly, I deleted trailing whitespace.

Question

The document refers to
http://java.sun.com/products/jdbc/jdbctestsuite-1_2_1.html

Would it make sense to provide instructions for the seemingly
newer test suite available at
http://java.sun.com/products/jdbc/jdbctestsuite-1_3_1.html

Thanks,
Vadim