fix division displacement #387
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- division vector was not normalized after orthogonal projection onto orientation-defined plane
- this would lead to inconsistent displacements
- e.g. in 2D, a rand_vec of (0,0,1) would lead to 0 displacement
- the daughter cell was displaced by the full radius and the parent cell by half the radius in the opposite direction
- this led to a center of mass shift (in the rand_vec direction) of radius/4
- now, both are displaced by half the radius in opposite directions, preserving center of mass
- by using 1/2 the radius, the cells will remain overlapping, which the mechanics module will resolve over time
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