Log Message:-----------
Added support to not add casts to null values.Thanks Waldemar Bergstreiser for heads up.
Modified Files:-------------- 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)
