Improve angeli test
See merge request !2607 (merged)
(cherry picked from commit 846dd8b5)
75858e5c [test][ff][angleli] Cleanup time-dependent functions 6aa64286 [test][ff][angeli] Enable setting the start time 91110633 [test][ff] Integrate initial and boundary conditions for velocity for better accuracy 2f89ac0c [test][angeli] add test for averaging velocity initial and boundary conditions