generalizing code

[SimonRubenDrauz]

To generalize calculate derivatives and extract results on branch_models.py level might lead to problems in near future, as a most abstract class defines really real and concrete functions/classmethods. Therefore, there should be a discussion on how to make the code as abstract as possible, prevent duplicated code and seperate it from really concrete functions which should only be part of the real component models.

[dlohmeier]

This problem should be tackled with the numba development (cf. dev_numba branch or PR #335 or Issue #242 ). What I suggest there is:

• make calculate_derivatives a global function to be called on the whole branch pit (actually, almost all components do nearly exactly the same thing, as you pointed out)
• implement two class methods for all components for a priori and a posteriori adaption of the derivative values

Of course this means that we have to take care of a very general behavior for all types of branches, but we actually do that already and still go through all components individually instead of performing this step just once.

[dlohmeier]

The dev_numba branch is merged. The only feature we still miss somehow is a possibility to tell the global result extraction function which results to extract. Currently, this is somewhat hard coded and the components can decide whether they need these results and could extract further results for their own, but maybe there is a smarter way to do this.

[dlohmeier]

The remaining problem already has an issue #374 .