Merge branch 'fix_minimal_sph' into 'master'
Fix the minimal version of SPH Ok, I have now fixed the minimalistic implementation of SPH. That's the one that should be used as a template for other people to implement their stuff. It's overly documented and now works on all the test-cases we have in the examples directory. Don't know if you want to look at this or not @pdraper given that it does not affect our default setup at all. Solves #148. See merge request !218