Issue appropriate error when importing .vdb file with wrong voxel type.
Issue #64
new
If a user creates a .vdb with colored cubes data but then tries to attach it to a TerrainVolume then the resulting error is not very clear:
CubiquityException: An exception has occured inside the Cubiquity native code library. Error code 'CU_RUNTIME_ERROR' with message "VoxelDatabase does not have the expected VoxelType of 'MaterialSet'". Please see the log file 'Cubiquity.log' for more details.
This should somehow be handled better.