Return values of GetDefaults and other getters

[IiroAhokainen]

Calling GetDefaults() with any neuron model returns a dictionary of default parameters. There are entries that are specific to the called neuron model (actual parameters of the model) but also more generic entries, such as 'available', 'elementsize', and 'node_uses_wfr.' While some of these generic entries are self-explanatory, not all of them might be for new users. Finding documentation for these elements is difficult. The documentation is scattered on different pages if even it exists.

Would it be possible to add a documentation page where all these generic elements are explained?

[github-actions]

Issue automatically marked stale!