Log Message:
-----------
Greater concurrency on creation of NpgsqlBackendTypeMapping.
Modified Files:
--------------
Npgsql2/src/NpgsqlTypes:
NpgsqlTypesHelper.cs (r1.23 -> r1.24)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/npgsql/Npgsql2/src/NpgsqlTypes/NpgsqlTypesHelper.cs.diff?r1=1.23&r2=1.24)