Compute nodes that work for visualizations #65
Description
We need a reasonable way to send tasks back to the server and get responses. For example, for the challenge data I would like to be able to ask questions like "who was in this room during this period of time?". There is too much data to reasonably to load it all to the front end and once there it would take a long time to weed through it all, but a simple database query could answer it straight off.
Writing an analytic node would be straightforward enough, and the addition of variables to the nodes would be a step, but it would mean to many steps, and I want it it to be something I can tie into the visualizations themselves. I basically want to be able to make remote function calls back to the server (which is not exactly a fit for our RESTive approach).