npgsql - Npgsql2: Short-cut some potentially expensive equality

Log Message:
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Short-cut some potentially expensive equality comparisons in cases where objects are shallow copies of each other.

Modified Files:
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Npgsql2/src/NpgsqlTypes:
BitString.cs (r1.3 -> r1.4)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/npgsql/Npgsql2/src/NpgsqlTypes/BitString.cs.diff?r1=1.3&r2=1.4)
NpgsqlTypes.cs (r1.11 -> r1.12)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/npgsql/Npgsql2/src/NpgsqlTypes/NpgsqlTypes.cs.diff?r1=1.11&r2=1.12)