The dune-copasi-latest branches were updated, so rebuilding the image should be enough to remove current warnings.

For some reason this was wrongly defined on the initialization of the dune module

The dune module file is sufficient to get current version

* Modify time step to snap to final time on the base stepper
* Snap to final time using half of the remaining time
* Add test for time-snap problem
* Add CHAGELOG
* Snapping time with constant time-step does not change time-step

See quality/dune-testtools!141

  * This was an oversight. The CMake conditional shall check for `TARGET`. However, even if this is fixed, `dune-testtools` does not allow to make tests over aliased targets because it wants to modify the `EXCLUDE_FROM_ALL` property. The solution is to use the unalised targets while dune-testtools solves the problem.
* Make exec targets available on main directory
* Make alias targets available on test directory
Add CHANGELOG

On !60 CMAKE_FLAGS were replaced to CMAKE_OPTIONS since dunecontrol overrited them. These modified here were missing.

* There was a use of target_link_directories instead of target_include_directories.
* Executable targets were available but could not be compiled without its library.
* Dune dependencies are taken directly from its global variables. This enables MPI and UG_PARALLEL when necessary.
* The options file expected CMAKE_FLAGS and MAKE_FLAGS from environment, but dune-common happens to clear them before calling the options file. On this version, these are replaced by CMAKE_OPTIONS and MAKE_OPTIONS