Improve Identity/Score/Trust clone() testing:
- Check assertEquals() on all member fields
- Check assertNotSame() on all member fields except for enum and String since they will be re-used. For preventing db4o breakage it is critically important to not re-use member objects.
- NOTICE: The clone test will fail for Score and Trust since their clone implementation does NOT clone the truster/trustee yet. Will fix it in the following commit(s)