Add some configuration for scrutinizer

Try to squeeze a bit more value out of scrutinizer-ci by enabling a few additional checks, and disabling some others. Code duplication for example causes a lot of noise, suggesting refactoring to eliminate 'duplication' of 4 line code blocks that are only mildly similar to begin with. It is well intentioned, but produces too many bogus issues to be worth it.

Will install and the evaluate results.