Check if periodic face match can be optimized in parCon #70
Description
We can get rid of this O(n^2) loop:
https://github.com/Nek5000/parRSB/blob/master/src/con-periodic.c#L188
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We can get rid of this O(n^2) loop:
https://github.com/Nek5000/parRSB/blob/master/src/con-periodic.c#L188