Update to DUNE v2.6 (#68) · Issues · dorie / dorie

Update to DUNE v2.6

Description

DUNE Core v2.6 has been released. UG and PDELab received similar updates.

We should update to them asap.

Expected Adaptations

ReferenceElement had a major overhaul. It is now constructable with referenceElement(geometry).
Layouts for MultipleCodimMultipleGeomTypeMapper are deprecated.
This sounds really useful (for KnoFu?):

The new method MCMGMapper::indices(entity) returns an iterable range (instance of IntegralRange<Index>) with the indices of dofs attached to the given entity: for (const auto& i : mapper.indices(entity) ) dof = vector[i];
StructuredGridFactory returns a unique_ptr to the grid now
PDELab extracts the "natural" blocking size from the function space now. This will break un-squaring in adaptivity.hh
L2 operator now sets integration order by itself (is probably used in adaptivity)
Rename namespaces this time: Dune::PDELab::istl -> Dune::PDELab::ISTL

How to test the implementation?

Pipeline passing

### Description
[DUNE Core v2.6](https://www.dune-project.org/releases/2.6.0/#dune-2-6-release-notes) has been released. [`UG`](https://gitlab.dune-project.org/staging/dune-uggrid/blob/master/CHANGELOG.md) and [PDELab](https://gitlab.dune-project.org/pdelab/dune-pdelab/blob/releases/2.6/CHANGELOG.md) received similar updates.

We should update to them asap.

### Expected Adaptations
* `ReferenceElement` had a major overhaul. It is now constructable with `referenceElement(geometry)`.
* Layouts for `MultipleCodimMultipleGeomTypeMapper` are deprecated.
* This sounds really useful (for KnoFu?):

> The new method `MCMGMapper::indices(entity)` returns an iterable range (instance of `IntegralRange<Index>`) with the indices of dofs attached to the given entity: `for (const auto& i : mapper.indices(entity) ) dof = vector[i];` 
* `StructuredGridFactory` returns a `unique_ptr` to the grid now

* PDELab extracts the "natural" blocking size from the function space now. This will break un-squaring in `adaptivity.hh`
* `L2` operator now sets integration order by itself (is probably used in adaptivity)
* Rename namespaces this time: `Dune::PDELab::istl` -> `Dune::PDELab::ISTL`

### How to test the implementation?
* Pipeline passing

Edited Jun 08, 2018 by Lukas Riedel

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