The tests have been modified to work under NUnit 2.4.6
(the one currently used in the project).
They will also work with NUnit 2.5+ as is, but will look better
if you #define NUNIT25 for them.
AssetTests: The name has changed to reflect the fact it is no longer a base class,
but the complete asset test for all supported databases.
The test can also check storing of CreatorID, but the feature is
disabled at this commit!
