[autotools] added ax_python_devel.m4
[autotools] use another variant of ax_python_devel.m4
[autotools] patch ax_python_devel.m4 to be optional
[autotools] add AX_PYTHON_DEVEL
[autotools] add ax_boost_python.m4
[autotools] add AX_BOOST_PYTHON
[fem.namespace] added mixxing guard
[autotools] fix python version
[la.container.eigen] pull in backend() from base class
Merge branch 'master' of https://github.com/tobiasleibner/DUNE-Stuff
[functions.interfaces] added missing includes
[test.functions_functions] added try/catch guard
[grid.fakeentity] added geometry
[functions] updated Function -> Functions
[functions.expression] added missing order()
Merge remote-tracking branch 'official/master'
Revert "[functions.checkerboard] use GlobalFunctionInterface instead of LocalizableFunctionInterface"

This reverts commit b60b99d8b1a395c3306dcc6f57986a07e4e2181c.
[test.functions_*] disable warnings from core modules
[common.logging and common.ranges] disable warnings from core modules
[functions.interfaces] disable warnings from core modules