Manage experiments and sim databases with web interface

[bloer]

Currently, running bgexplorer requires writing python classes and functions to define the interaction with the simulation database. This allows for lots of flexibility, but makes many tasks that should otherwise be simple require halting the application, making code changes, and restarting. Also, each bgexplorer instance is a standalone server process, so running multiple experiments on a single machine is resource intensive and requires managing multiple processes.

If we sacrifice some of the flexibility and require a MongoDB database and that the data follow relatively limited format, each simdb backend could be configured in a web interface, and each experiment is mostly a collection of sim views.