[discretizations] added some bindings to MS discretization

* create_ones()
* estimate_local()
* visualize_information()
* solve_for_local_correction()
[parameters.base] alway return a parameter in map_parameter()
[core.wrapper] does this make sense?
[functions.interfaces] fixed nullptr related warning
[functions.interfaces] use DUNE_STUFF_SSIZE_T
replaced ConfigTree by Configuration
replaced DUNE_THROW_COLORFULLY by DUNE_THROW
[common.exceptions] marked DUNE_PYMOR_THROW, PymorException as deprecated
[tests.la_container] removed (tested in dune-stuff now)
[test.functionals] fixed scalar parameter functional usage
[tests.operators] use ContainerFactory from dune-stuff
[tests] use main from dune-stuff
[tests] updated exceptions
moved tests -> test
[common.exceptions]
updated all depreceated exceptions
[autotools] removed some empty subdirs
[cmake] added first draft of experimental cmake support
[buildsystem] remove doc
[cmake] adapted PymorUtils