JDBC patch for util.Serialize and jdbc2.PreparedStatement

The attached file: serializepatch.tgz, contains a patch for
org.postgresql.util.Serialize and org.postgresql.jdbc2.PreparedStatement that
fixes the ability to "serialize" a simple java class into a postgres table.

The current cvs seems completely broken in this support, so the patch puts it
into working condition, granted that there are many limitations with
serializing java classes into Postgres.

A little test program is included with the patches.  The comments in the
Serialize class tries to explain how all this works.

- Robert Easter