Equated designators can yield IDs not currently present in the task tree and don't show up in the MongoDB. Fixed this.

IDs for designators were not looked up in the table of present IDs, but rather directly generated randomly.
Added support for annotating designators appended to task tree nodes

The annotations supplied here can be used as a hint about what kind of designator the appended instance is and what its purpose was.
Added OWL exporter support for designator purposes 'perception-request', 'perception-result', and 'object-acted-on'.