REFACTORING: Viewpoint formatting to be reused.
REFACTORING: Recursive structures make Mustache unusable.
FIX: Topics with an empty array of broader topics

should be displayed as the upper topics of the viewpoint.
FEATURE: Display an item as an HTML page.

If JSON flavor is not explicitly asked for, Whole viewpoints are shown as nested lists, and topics that are bound to the item are displayed as bold.