Fix cyclicACMI (runtime-selection-geometry, scaling-of-weights)

Changes to make cyclicACMI work. The issues were (mostly) due to the calculation of all geometry in one go (through the mesh.updateGeom() virtual call). This is normally ok except for cyclicACMI which has to adapt the (geometric) areas before calculating any cell based quantities.

2. Extend 2-step initialisation to all dynamicFvMesh to enable use of run-time selection inside all solvers.