clean up warnings produced by Eclipse

src/interfaces/jdbc/org/postgresql/Driver.java.in

src/interfaces/jdbc/org/postgresql/fastpath/Fastpath.java

src/interfaces/jdbc/org/postgresql/geometric/PGcircle.java

src/interfaces/jdbc/org/postgresql/geometric/PGpoint.java

src/interfaces/jdbc/org/postgresql/geometric/PGpolygon.java

...c/org/postgresql/jdbc1/AbstractJdbc1DatabaseMetaData.java

.../org/postgresql/jdbc1/AbstractJdbc1ResultSetMetaData.java

...ces/jdbc/org/postgresql/jdbc1/AbstractJdbc1Statement.java

...terfaces/jdbc/org/postgresql/jdbc2/AbstractJdbc2Blob.java

...terfaces/jdbc/org/postgresql/jdbc2/AbstractJdbc2Clob.java

...es/jdbc/org/postgresql/jdbc2/AbstractJdbc2Connection.java

...c/org/postgresql/jdbc2/AbstractJdbc2DatabaseMetaData.java

.../org/postgresql/jdbc2/AbstractJdbc2ResultSetMetaData.java

src/interfaces/jdbc/org/postgresql/jdbc2/Array.java

...aces/jdbc/org/postgresql/jdbc2/PBatchUpdateException.java

...interfaces/jdbc/org/postgresql/jdbc3/Jdbc3Connection.java

...es/jdbc/org/postgresql/jdbc3/Jdbc3RefCursorResultSet.java

...aces/jdbc/org/postgresql/test/jdbc2/CallableStmtTest.java

...postgresql/test/jdbc2/DatabaseMetaDataPropertiesTest.java

.../jdbc/org/postgresql/test/jdbc2/DatabaseMetaDataTest.java