mesher parameters that can vary from volume to volume.

[ebknudsen]

One problem we find with the meshing tool is that meshing parameters are difficult to define to work for all objects in a complicated model.
It would be beneficial if we could allow a default set, which could be overridden for selected volumes.

For the gmsh-backend an approach could be to use the notion of "physical-partitions" which could then be meshed separately. Obviously it is necessary to have the same parameter set for shared/imprinted surfaces.

For the cq/mmg-backend it would be similar.

[ebknudsen]

If #86 were implemented this would be automatically supported.