[BUGS] Multi-byte character bug

[Richard So]

Two bugs has been found in the SQL parser and Multibyte char support:   1.       ��Problem connecting to database: java.sql.SQLException: ERROR: Invalid EUC_TW character sequence found (0xb27a)�� was reported in using JDBC driver to insert record, similar error reported when using ODBC driver and psql, since auto-conversion from client to server should convert the charcter to a valid EUC_TW char, therefore this is a bug   2.       inserting record with ���\�� chinese char, the SQL parser report something like ��Problem connecting to database: java.sql.SQLException: ERROR: parser: parse error at or near "4567891"�� (similar in jdbc and odbc), and the error ��unterminated string�� has been reported when using psql.   I��ve found the problem exists since 7.1.x till 7.2.*.