Added view description for user, and associated fields
Updated tests and supporting code to reflect change of user URI property to annal:user_uri (was annal:uri).
(The previous value was running into problems with special-case handling of annal:uri values.)
Basic value mapping for rendering (tokenlist) working - more tests needed
Add more tests for token set rendering in user permissions.
Fix some problems with handling improperly formed token sets.
Rename TokenList -> TokenSet to mnore correctly reflect JSON-LD interpreation.
Move 'get_entity_values' from 'views.fields.render_utils' to 'views.fields.bound_field'
Complete renaming of TokenList to TokenSet.
Add noted for further considerations of using render objects rather than templates.
Change 401 error to 403 for authenticated user missing permissions