Merge branch 'master' into sane

Conflicts:
	nutils/topology.py
Merge branch 'sane' of https://github.com/nutils/nutils into sane
Merge branch 'sane' of https://github.com/nutils/nutils into sane
update debug output
create fully compatible python SaneArray fallback
Merge branch 'sane' of https://github.com/nutils/nutils into sane
move numeric module into subdirectory