Merge branch 'master' of https://github.com/wwu-numerik/dune-stuff

Conflicts:
	dune/stuff/test/common_configtree.cc
Merge branch 'master' of https://github.com/wwu-numerik/dune-stuff
Merge branch 'master' of https://github.com/wwu-numerik/dune-stuff
Merge branch 'issue_282_configcontainer' of https://github.com/wwu-numerik/dune-stuff
Merge branch 'master' of https://github.com/tobiasleibner/DUNE-Stuff
Merge branch 'master' of https://github.com/wwu-numerik/dune-stuff
Merge branch 'master' of https://github.com/tobiasleibner/DUNE-Stuff
Merge branch 'master' of https://github.com/tobiasleibner/DUNE-Stuff
Merge branch 'master' of https://users.dune-project.org/repositories/projects/dune-stuff
Merge branch 'master' of https://github.com/tobiasleibner/DUNE-Stuff
Merge branch 'master' of https://github.com/wwu-numerik/dune-stuff
Merge branch 'master' of https://github.com/wwu-numerik/dune-stuff
[playground.grid.provider.starcd] fix range of logical not (!)
Merge branch 'master' of https://github.com/wwu-numerik/dune-stuff
Merge branch 'master' of https://github.com/wwu-numerik/dune-stuff
[common.exceptions] marked test_results_missing as deprecated
[test.common_string] add another bool test, refs #12
[common.string] added some meaningfull error messages
[common.configuration] added some meaningful error messages