Add the TupleVector class

The TupleVector class is a multitype container without algebraic operations. It relates to Dune::MultiTypeBlockVector like std::vector relates to Dune::BlockVector. This is achived by augmenting std::tuple by the following:

• operator[] for Dune::index_constant arguments
• static size()

You can now write code like this which will work for multitype and classic vector like containers:

    using namespace Dune::Hybrid;
    forEach(integralRange(size(v)), [&](auto i) {
        v[i] = i;
    });

Notice that TupleVector was already present as implementation detail of two tests in dune-common and that dune-functions and dune-solvers also both contained their own variants

If we have a release soon, I'd like to have this in there. Any objections to merging this?

Milestone changed to %DUNE 2.5.0

If no one objects I'll merge this next week.

Please mention it on the recent-changes page when you do.

@carsten.graeser What is the status here?

Added 88 commits:

• e7568cc5...401ad9be - 86 commits from branch master
• 38d5ba56 - Add the TupleVector class
• 3d5152be - [test][cleanup] Use Dune::TupleVector instead of local implementation

Compare with previous version

Mentioned in commit 40752c75

Status changed to merged

Mentioned in commit d0a2c81c

Mentioned in merge request !168 (merged)

Mentioned in commit c39a2297

mentioned in commit 772d88e3