ITS#4501 Add java.sql interface methods introduced by JDK 6.

src/com/octetstring/jdbcLdap/jndi/JndiLdapConnection.java

src/com/octetstring/jdbcLdap/sql/JdbcLdapDBMetaData.java

src/com/octetstring/jdbcLdap/sql/JdbcLdapMetaData.java

...m/octetstring/jdbcLdap/sql/JdbcLdapPreparedStatement.java

src/com/octetstring/jdbcLdap/sql/JdbcLdapStatement.java

src/com/octetstring/jdbcLdap/sql/LdapResultSet.java

src/com/octetstring/jdbcLdap/util/ObjRS.java

src/com/octetstring/jdbcLdap/util/RSMetaData.java