D3Q27 Directions - Order and Naming

To really reuse code and to further unify the code lines, the directions must be matched. While doing this it could be also useful to adapt the naming scheme.

Currently, we have the following naming scheme with inconsistent order:

We need to agree on two points.

1. What order of directions should we follow?
2. Should we stick with the naming scheme or adapt it? Alternatives could be for example:

• MPZ. (X = Minus, Y = Plus, Z = Zero)
• ABC (X = (A) Minus, Y = (B) Plus, Z = (C) Zero)