Merge branch 'testPeriodicBC' into 'master'
Test periodic bc This tests the periodic boundary conditions which are generated in `space_getsid()` and used in `runner_dopair1_density`. An 8x8x8 mesh is generated that is periodic and 26 pair interactions are computed for the following cells: * All 8 corner cells * The cell at the centre of each face * The cell at the centre of each edge These checks are performed for both unperturbed and perturbed cells. See merge request !350
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