Merge branch 'feature/implement-entity-type' into 'master'

ref:extensions/dune-foamgrid Implement the convenience function of the entity
interface to get the geometry type without constructing a geometry first.

See merge request [!63]

  [!63]: gitlab.dune-project.org/extensions/dune-foamgrid/merge_requests/63

Constructing a geometry to get the type is always more expensive if
you just need the type. This implement the more efficient interface.

Merge branch 'feature/insert-boundary-segment' into 'master'

ref:extensions/dune-foamgrid Has to wait for
[core/dune-grid!348] to be
merged.

See merge request [!59]

  [core/dune-grid!348]: core/dune-grid!348
  [!59]: gitlab.dune-project.org/extensions/dune-foamgrid/merge_requests/59

Merge branch 'cleanup/factory-remove-unused-data-member' into 'master'

See merge request [!62]

  [!62]: Noneextensions/dune-foamgrid/merge_requests/62

Merge branch 'bugfix/facet-vertex-invalid-this-pointer' into 'master'

ref:extensions/dune-foamgrid This solves the issue with the wrong leafIndex_
in the vertex_ array.

See merge request [!61]

  [!61]: gitlab.dune-project.org/extensions/dune-foamgrid/merge_requests/61

Merge branch 'feature/vertex-pointer-face-1d' into 'master'

ref:extensions/dune-foamgrid Instead of storing a nullptr and document
undefined behaviour we can actually store a this pointer and have perfectly
defined behaviour.

See merge request [!60]

  [!60]: gitlab.dune-project.org/extensions/dune-foamgrid/merge_requests/60

Instead of storing a nullptr and document undefined behaviour we
can actually store a this pointer and have perfectly defined behaviour.

Merge branch 'feature/sumouternormalerror-warning' into 'master'

ref:extensions/dune-foamgrid With upstream changes in [core/dune-grid!332] the
test now pass whereas before they were expected to fail due to the sum of
outer normals check.

Depends on [core/dune-grid!332] to be merged.

Fixes [#7]

See merge request [!58]

  [core/dune-grid!332]: gitlab.dune-project.org/core/dune-grid/merge_requests/332
  [#7]: gitlab.dune-project.org/NoneNone/issues/7
  [!58]: gitlab.dune-project.org/extensions/dune-foamgrid/merge_requests/58


Closes #7

Merge branch 'fix/geometryinoutside-1d-grids' into 'master'

See merge request [!57]

  [!57]: Noneextensions/dune-foamgrid/merge_requests/57

Merge branch 'fix/leafindexset-intitializer-list' into 'master'

See merge request [!55]

  [!55]: Noneextensions/dune-foamgrid/merge_requests/55

Merge branch 'feature/remove-foamgridentitypointer' into 'master'

ref:extensions/dune-foamgrid FoamGridEntityPointer is not needed. We simply
implement the dereference and equal functions for all iterators.

See merge request [!54]

  [!54]: gitlab.dune-project.org/extensions/dune-foamgrid/merge_requests/54

Merge branch 'cleanup/fix-compiler-warning-exception-handler' into 'master'

See merge request [!52]

  [!52]: Noneextensions/dune-foamgrid/merge_requests/52

Merge branch 'fix/default-constructor-initializer-list' into 'master'

ref:extensions/dune-foamgrid A default constructed FoamGrid should be a valid
(but empty) grid. The list of entites was previously uninitialized but this
data member is accessed in several interface functions.

The entity list is now properly initialized. Level 0 always exists, but is
empty (empty entity lists) when the grid is default constructed. An empty
level index set is also created for level 0.

Improves test by adding an empty grid test.

See merge request [!49]

  [!49]: gitlab.dune-project.org/extensions/dune-foamgrid/merge_requests/49