Feature/functions interface 2.5-compatible
This is a cleanup of !114 (closed).
Feature:
-
a wrapper class to implement a dune-functions
compatible functions interface using old-style pdelab functions -
interpolate from old-style functions and callables -
add a dune-functions
compatibleDune::PDELab::DiscreteGridViewFunction
-
a free function makeLocalFunctionTree
to transform trees if old-style functions, trees of callables or trees ofdune-functions
functions int local functions
Furthermore I suggest do deprecate the old-style functions