ISIS-162 logon tag can now use user roles from a user domain object  to
set up the session.
ISIS-162 - added interaction variables to links in list items.
Making action link and button also work with transient objects.
ISIS-162 - allowing action links to use parameters
Isis-162 - redesigned Scimpi based archetype.
ISIS-367: wicket viewer using regular ThreadLocal IsisContext
ISIS-367: minor tidy up