[staggered][geometry] Store two parallel distances per svcf lateral axis, not three

Merged Ned Coltman requested to merge feature/improve_ff_nonuniformdistances into master

Previously the width of the self scvf was stored in the parallel distances array, storing a total of three distances. This was to ensure that the CC parallel distance is correct for nonuniform 3D grids.

This self distance is not necessary to be stored in the parallel data, as this information already exists for each scvf. This commit removes this first distance and calculates the CC parallel distance using the existing scvf information and the other two parallel distances.

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