Prefix all param and state names with channel name

[michaeldeistler]

API changes

FYI @coschroeder @kyralianaka @jnsbck @lappalainenj

• HHChannel is now called HH

net.insert(HH())

• All channel parameters and states should, by convention, be prefixed with the channel name:

net.make_trainable("HH_gNa", 0.3)

• set_params and set_states are both called set now

net.set("radius", 0.2)
net.set("HH_m", 0.1)

• get_params and get_states does not exist anymore. Use .show() instead.

net.show()

Rationale for this PR

Questions

• How to deal with parameters that are global (i.e. exist across channels)?
• How to deal with global states (i.e. states that can be modified by many different channels)?
• What to use as a good naming convention?

Solution

• parameters that already exist in a particular compartment are not added
• states that already exist in a particular compartment are not added
• as a convention, all states and parameters should be prefixed manually by the channel name. I hope that this makes it intuitive which parameters and states are being accessed in writing the channels.

To make this happen, we had to fundamentally change how channels are stored. See #202