Read in glia data

[juanchopanza]

Glia f5 files have an extra block of data. See if these can be loaded without compromising performance or maintainability.

Example file

[dkeller9]

The extra surface area information can be used to:

1. assign surface channels
2. calibrate metabolic model
3. validate geometrical models
4. visualize the astrocytes

[juanchopanza]

This isn't very relevant to NeuroM. What is relevant is that you're interested in surface area. But how do you define it in terms of the new info?

[dkeller9]

It would be nice to have an easy way to access the data from NeuroM.

[asanin-epfl]

As of NeuroM v2 the reading is on MorphIO. Closing in favor of BlueBrain/MorphIO#256.