Plasma project

[wkerzendorf]

The goal of this project is to replace the existing with a new Framework for Plasma calculations. The new Framework is more modular than the current one and allows easy implementation of additional physics. Currently this is not in the code, but is part of a branch as outlined on the ideas page.

These are the suggestions to do a PR on the plasma/restructure-branch:

1. Get familiar with the new structure
2. Implement the beta-sobolev calculation in a new ProcessingPlasmaProperty - a stump exists here: https://github.com/tardis-sn/tardis/pull/215/files#diff-2c2a4ed36d667e096096f9a62d21216bR127
   In the existing code they are calculated here: https://github.com/tardis-sn/tardis/blob/master/tardis/plasma_array.py#L537

Over the summer we would like to see:

• a full test suite for the new plasma branch
• finishing of the visualization features for the plasma
• Implementing additional physics needed for late time spectra

[liangjiaxing]

Could the function macro_atom.calculate_beta_sobolev() be called in the new ProcessingPlasmaProperty
For example, doing something like this:

class BetaSobolev(ProcessingPlasmaProperty):
    name = 'beta_sobolev'
    def calculate(self, tau_sobolev):
        beta_sobolevs = np.zeros_like(tau_sobolevs.values)
        macro_atom.calculate_beta_sobolev(self.tau_sobolevs.values.ravel(order='F'),
                                          self.beta_sobolevs.ravel(order='F'))
        return beta_sobolevs

[wkerzendorf]

make a PR @liangjiaxing

[unoebauer]

@wkerzendorf: status of this? Is this still relevant after the plasma overhaul?