bind, queries

Complete round trips are now fully supported: Rolon -> RoleML -> DRM -> RoleML -> Rolon. So you can copy things out of the database, use DRM to edit them, and then use the results to create new Rolons. Still need to write a guide, but other than that it is done--with 3 sample programs.

The next step is to modify the way eval works to support queries. At the same time I expect to be able to support having one DSec execute another and then process the results. This seems like a reasonable capability to have, especially once you move past trivial examples.