used on wide format pages
In the past, the left side navigation buttons were the main aid to topic navigation,
the selection available on a wide page is determined by a look-up system that links similar in-context topics
Heritage pages also had an upper navigation bar that was used to move to external web sites e.g. 80
Topic pages have two schemes ~/heritage/includes/moonav3 and ~/runtime/sidenavSV.php
The lower menu offers a "means of jumping" to associated topic pages.
Topic pages that employ functions/unipageSb have the data for lower menus stored at Sutton