Merge pull request #193 from dune-community/python-move-to-subdir-2

dune/xt/common/exceptions.hh

dune/xt/common/python.cc

dune/xt/common/python.hh

dune/xt/common/timedlogging.cc

dune/xt/common/timedlogging.hh

python/dune/xt/CMakeLists.txt

python/dune/xt/__init__.py

python/dune/xt/common/CMakeLists.txt

python/dune/xt/common/__init__.py

python/dune/xt/common/bindings.cc

python/dune/xt/common/configuration.hh

python/dune/xt/common/empty.cc

python/dune/xt/common/fmatrix.hh

python/dune/xt/common/fvector.hh

python/dune/xt/common/logging.cc

python/dune/xt/common/logging.py

python/dune/xt/common/timings.cc

python/dune/xt/common/timings.py

python/dune/xt/empty/__init__.py

python/test/base.py