Plots for reports

• Adding the filtered class for the spike and frame reports
• Adding the plots for the filtered spike/frame reports
• Fix empty dict / array for reports query
• Use categoritical values for attr in @library
• Fixing edge iter_connection with unique_node_ids

Fix empty group queries in nodes and simulation reports

Fix the empty list/array/dict in simulation reports and in node.ids()

Node set's full support

• Node sets file has its own class
• Compound node sets can be used in node sets file
• Add population and node_id keys in node sets and node's queries
• Add the $and and $or operators to the node's queries
• Node sets are now part of the circuit and not part of the node storage anymore
• Add the node_sets_file in the circuit_config and remove it from the node storage

Simulations support

This version support the sonata simulations.
User can now read frame and spike reports from a common public object: Simulation.

Multi-population support

• Add the multi-population support for circuits
• Add a sonata circuit validator
• Update the constant containers
• Implement "node_id" in node set files

add dynamics_params to EdgePopulation

• Add "@dynamics:" parameters for edges.
• Always use the node_id naming convention in code.