Remove deprecations prior to 2.9

See merge request !695

dune/common/function.hh is going to be removed

[geometrygrid] Replace Transitional::ReferenceElement

See merge request !694

It is deprecated and should have been replaced years ago

Small fixes in grid tests

See merge request !557

fix a code typo in basicwriter.hh

See merge request !692

Add CI pipeline running the codespell tool

See merge request !691

And fix all spelling errors that codespell currently finds.

The 'codespell' tool complained about the variable name 'wit'
that is used a few times as a loop variable.  Rather than
having codespell ignore it this patch simply rewrites the
old iterator loops using range-based 'for'.  That simplifies
the code and gets rid of the codespell error at the same time.

remove support for automake to cmake migration tool

See merge request !690

typo: multilply -> multiply

See merge request !689

[bugfix]Add copy/move assignment for UGGridEntity

See merge request !688

In the case `0<codim<dim`, a `UGGridEntity` contains a `std::unique_ptr`.
Hence the default copy assignment operator cannot work. This patch
adds a custom copy assignment operator and marks the move assignment
operator as `default` to fix the bug.

There is no canonical place where entities are checked.
`checkEntityLifetimeForCodim()` does some entity checks, but
only for codims, where there's an iterator.
Vy putting it into the `subIndexCheck()` it's also tested
if this is not the case and entities are only available via
`subEntities(e, cd)`.

Currently this makes the gridcheck fail for `UGGrid`.

Feature/improve pickling and add paraview reader

See merge request !675

Add missing include <cassert>

See merge request !686

Do not add compile definitions to ALIAS target

See merge request !683

[Python] improve handling of time series data

add copyright

run 'python testpickle.py'
Load the 'dunereader' plugin into paraview.
After that 'dump.dbf' can be read and the subsampling level dynamically chosen
to view the grid function given in picklefunc.py.

some more docu for the dune paraview reader

[Python] add pickling to general grid views

[Python] minor changes

[fix] remove debug output

[bugfix]

[bugfix]

improve error messages

[Python] don't store an entity* in the python grid function but use optional<Entity> instead

See merge request !680

Fix a compiler error in the debug output of checkIndexSet

See merge request !677

Fix template deduction for 1d arrays in structuredgridfactory

See merge request !676

Add ALBERTA_DEBUG=1 flag when linking against Alberta debug libraries

See merge request !678

Use flexible GeometryType containers in IndexSet

See merge request !650

Remove geomTypes method from grid implementations

See merge request !651