Minimise limiter status based halo refinement

If the a-posteriori troubled cell indicators indicate a troubled cell, we refine this cell down to the finest mesh level specified by the user.

I further have to ensure that I can place helper cell layers around the troubled cell also on the finest mesh level. Thus, I need some halo refinement.

Currently, I refine all neighbours of a cell with limiter status 1 and 2 in order to ensure that the diagonal neighbours are refined as well.

In principle, I could however refine the cells with have a limiter status of 1 and the cells which have two neighbours with a limiter status 1.