Log Message:
-----------
Handle negative values (thanks to Mathieu Fenniak <mathieu(at)fenniak(dot)net>) and singular values such as "1 day"

Modified Files:
--------------
    Npgsql2/src/NpgsqlTypes:
        DateDatatypes.cs (r1.2 -> r1.3)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/npgsql/Npgsql2/src/NpgsqlTypes/DateDatatypes.cs.diff?r1=1.2&r2=1.3)

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