clean-up in test/unit/test.py
clean-up in test/regression/test.py
remove unused file demo/undocumented/dg-advection-diffusion/python/functions2D.h
remove improperly commited demofile demo/undocumented/extrapolation/python/demo2.py
remove non-working multidomain demo with no apparent additional functionality compared to restriction demo
Fix in FindCHOLMOD.cmake by Johannes
Merge branch 'fix-issue-164'