Log Message:
-----------
Added support to not add casts to null values.
Thanks Waldemar Bergstreiser for heads up.
Modified Files:
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Npgsql2/src/Npgsql:
NpgsqlParameter.cs (r1.15 -> r1.16)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/npgsql/Npgsql2/src/Npgsql/NpgsqlParameter.cs.diff?r1=1.15&r2=1.16)