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SingleCodimMapper is broken

The OrderingTag for single codimension SingleCodimMapper (i.e. Fast Finite Volume) is entirely broken.

With a very quick check on test-transport-ccfv.cc by adding SingleCodimMapper to the grid function space definition it is easy to realize that:

  • The LFSIndexCacheBase specialization lacks definitions for DOFIndex and ContainerIndex.
  • The SimpleContainerIndex has no hash and cannot be used in the unordered maps for constraint containers.
  • The SimpleDOFIndexAccessor has no methods for geometryIndex and entityIndex.
  • The SingleCodimLeafOrdering has no _gfs_data.
Edited by Santiago Ospina De Los Ríos