Type more basic than DescriptorUnit

Many a theory gang aft aglee when coded. Case in point. I made type more basic than DescriptorUnit when I started to depend on type when instantiating a Rolon. But trying to first lookup the DU just put things in a recursive loop.

The answer is simple. The Type descriptor entry must be set on a role itself. It is only acceptable to get the DEnt from the descriptor unit when creating a new role... sometimes. The additional problem comes up when creating the descriptor units for a cabinet. Resolving that just means doing some hard coding.

Anyway, I've made a start with JSecs, though its not tested as well as I'd like. (Its late.)

Bill