Copy method 'makeFunction' into namespace Dune::Fufem

The method 'makeFunction' was declared in a namespace 'Functions'. This leads to unfortunate clashes with code from the dune-functions module, in particular when using

using namespace Dune;

This patch introduces a copy of that method in the namespace Dune::Fufem (never mind the copy: the method is very small). It also deprecates the method in the old namespace. That way, code that currently works still does so in the future, but we now have a migration path away from that unfortunate 'Functions' namespace in dune-fufem.

BUG: https://git.imp.fu-berlin.de/agnumpde/dune-fufem/issues/11

mentioned in issue #11

added 10 commits

• cfea2225...f999ab17 - 9 commits from branch master
• aa192f67 - Copy method 'makeFunction' into namespace Dune::Fufem

Compare with previous version

@graeser , can this be merged?

@oliver.sander_at_tu-dresden.de I'm unsure. When having a look at how to do a transition towards the dune-functions function interface, I came to the conclusion that this is hardly possible in a compatible way. As a remedy one could make use of the fact that (fortunately) most of dune-fufem is not in Dune::Fufem. This allows to deprecate all the old stuff while providing the new cleaned up implementations in Dune::Fufem. This is getting harder if we pull more old stuff into Dune::Fufem. Maybe we can use Dune::Fufem::Old:: for this use case.

Agreed. As makeFunction is/will be deprecated anyway, there is no point in moving it around.

This conclusion is as valid now as it was two years ago. I will hence close this.

closed