Add 'Last Read' Field

Test:

Modify earlier tests to add a 'Last Read field, check that it is serialized appropriately and that web page is generated appropriately.

Notes:

Added another acceptance test, for checking fields. Refactored the entity writing code and the installation/test code to remove some duplication and make it easier for different tests to use different databases.

Last modified: Sat Sep 10 16:16:16 PDT 2005