Not only a data processor

[henry2004y]

As this package becomes more and more mature, we can think one step further. We may be able to build a simple Vlasov solver!
Since we can read VLSV restart files, the whole information needed for performing a run is there. Then what we need is basically a Vlasov solver and a field solver.

How shall we do that?

• Construct the grid, i.e. MetaVLSV from scratch using the same parameters as in the Vlasiator configuration file
• Moments calculations
• Add Vlasov solvers
• Add field solvers
• Port diffusion solver to Julia