making citations visible topics

In a eariler version of the Ark written for Norm, citations were included in the list of visible topics. This made the Ark much more organic, as a reference by a topic to a second topic made the first topic visible to the second. But in the current version of the Ark, citations are "hidden"--they are only displayed when you use the cit command.

Now if we make citations visible topics, then citations to the current topic should be included in its display. This all sounds good to me, but I'm thinking that I'd like to make some progress on descriptors before taking another side trip.