Merge branch 'feature/NewHOBCs' into 'master'
Feature/newhobcs Added in a new convective like outflow boundary condition as well as a velocity correction scheme using a weak pressure Poisson equations. To complement this I have also tried to restructure the description in the user guide to use the Guermond and Shen approach to motivate both the standard velocity correction scheme and the weak pressure form. See merge request !713
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