orafce - orafce: Add decode(date, date, ...).

Log Message:
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Add decode(date, date, ...).

Modified Files:
--------------
    orafce:
        orafunc.sql.in (r1.52 -> r1.53)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/orafce/orafce/orafunc.sql.in.diff?r1=1.52&r2=1.53)
        uninstall_orafunc.sql (r1.3 -> r1.4)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/orafce/orafce/uninstall_orafunc.sql.diff?r1=1.3&r2=1.4)
    orafce/expected:
        orafunc.out (r1.20 -> r1.21)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/orafce/orafce/expected/orafunc.out.diff?r1=1.20&r2=1.21)
    orafce/sql:
        orafunc.sql (r1.18 -> r1.19)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/orafce/orafce/sql/orafunc.sql.diff?r1=1.18&r2=1.19)