- adds a finalizer method to AbstractJdbc1Statement to clean up in the case of
   poor user code which fails to close the statement object
 - fix ant build file to correctly detect dependencies across jdbc1/jdbc2/jdbc3
 - fix a coupld of server prepared statement bugs and added regression test for
   them
Applied patch from Kim Ho:
 - adds support for get/setMaxFieldSize().
Also fixed build.xml to provide a better error message in the event that an
older version of the driver exists in the classpath when trying to build.