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Implement a Nedelec basis (of the first kind)

See merge request !269

This patch adds the implementation of a Nedelec basis.  The interface
allows bases of any order, grids in 2d and 3d, and with simplex and cube elements.
However, this initial implementation can only do the first-order basis
on triangle grids.

There are two types of Nedelec bases, known as the Nedelec bases of the
first and second kind.  The implementation in this patch has the 'kind'
as a template parameter, which can have values 1 or 2.  However, only
the case kind==1 is implemented right now.

Improve Raviart-Thomas-Basis

See merge request !270

The local finite element selection mechanism in RaviartThomasBasis would
only work properly if a Raviart-Thomas local finite element of given
order and space dimension existed both for cubes and simplices.
This is not the case for 3rd-order RT elements in 2d and 2d-order
RT elements in 3d:  They currently exist for cubes, but not for
simplices.  This patch makes the element selection logic more
flexible, and thereby implements these to new cases.

Added various previously untested cases to the test.

See MR !172 in `dune-localfunctions`

Remove unused stuff

See merge request !268

Add support for customizing basis dimension in TransformedIndexPreBasis

See merge request !265

Since the generic transformation is intended to simply
change the indexing scheme, it still forwards the
method `dimension()` to the wrapped basis. However,
this patch allows to change the dimension by
passing a fully custom transformation class.

Implement support for manual index transformations

See merge request !125

This pre-basis transforms the global multi-indices
of a wrapped pre-basis. This functionality can be helpful
to create indexing schemes which cannot be constructed using
the IndexMergingStrategies of PowerPreBasis and CompositePreBasis.

Fix a few typos in text

See merge request !264

[cmake] Require CMake 3.13

See merge request !250

mark the move constructor and move assignment operator noexcept in polymorphicsmallobject

See merge request !258

Use aligned_storage in PolymorphicSmallObject

See merge request !259

This automatically selects an alignment which is large enough
to store any type fitting into the buffer. This fixes
a bug with misaligned objects if the derived class stored
in the buffer has stricter alignment requirements
than the base class.

The test never used the check results and thus passed
regardness of potentially failing checks.

remove virtual from type_info member function

See merge request !257

Add test for Polynomial

See merge request !256

Add assignment operators to Polynomial

See merge request !254

Polynomial: Replace hardcoded type by template

See merge request !255

Fix self-assignment bug in PolymorphicSmallObject

See merge request !253

Fetch default yml files via different project instead of url

See merge request !251

This is a workaround for a bug that showed up after gitlab migration. See issue
infrastructure/issues0#62 for further discussion.

Merge branch 'implement-global-valued-bases' into 'master'

ref:staging/dune-functions\> We do this by introducing a new
LocalFiniteElement implementation called GlobalValuedLocalFiniteElement. This
new implementation wraps existing LocalFiniteElement implementations, but
applies a transformation to the evaluated shape function values (and
derivatives etc.). The transformation is a template parameter and can be
replaced. Currently only the contravariant Piola transform (for H(div) spaces)
is implemented.

See merge request [!241]

  [!241]: gitlab.dune-project.org/staging/dune-functions/merge_requests/241