Added test for milliseconds in Microsoft Access.

Associated commit DatabaseObjects:
3a22b6a1ea03529c233267d8ba922ab9fcf65e62
Corrected test for milliseconds to test all databases.
Corrected tests that could incorrectly fail due to not specifying connection type.
Added tests for serializing an enum value.

Associated commit DatabaseObjects:
ce2c057ec4433f3a4468a8931feb2d96705f9fce