Remove some Dune::VirtualFunction related stuff
This removes some function implementations based on the deprecated Dune::VirtualFunction
interface and related utilities and tests:
-
SumFunction
(replacement: lambda function) -
SumGridFunction
(replacement:Dune::Functions::ComposedGridFunction
with lambda function) -
ComposedFunction
(replacement: lambda function) -
ComposedGridFunctional
(replacement:Dune::Functions::ComposedGridFunction
with lambda function) -
Polynomial
(replacement:Dune::Functions::Polynomial
) -
NamedFunctionMap
(replacement:std::map<std::string, std::function<Range(Domain)>>
)