Network architecture container and selection/query language

[emuller]

Implement a Network architecture container which contains heterogeneous cells, 3d geometries, organizational structures such as columns, layers, domains, projections, etc. as well as simulation results: spikes, analog signals, time varying project parameters such as weights, connectivitiy (structural plasticity).

A design goal should be to allow this container to be queried to select for example, all cells that were within 5 mv of threshold in layers 4 and 6 within a certain time window and which project to a given cell, and with mean weights less than w.

This selected population could then be fed into a 3d visualization widget.

See also: ticket:49.