npgsql - Npgsql2: Changed public fields into properties.

Log Message:
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Changed public fields into properties. Miguel de Icaza from Mono project asked for this change because previous versions of Npgsql used to have properties and this change could break existing clients.

Modified Files:
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Npgsql2/src/NpgsqlTypes:
NpgsqlTypes.cs (r1.8 -> r1.9)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/npgsql/Npgsql2/src/NpgsqlTypes/NpgsqlTypes.cs.diff?r1=1.8&r2=1.9)