Polyhedral unroll #20
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Sieve transformation: use local dimensions of the scattering relation to schedule strided points differently.
Unroll by N is a sieve by N followed by shifting i-th union part by -i to make it execute on the same iteration as the first part.
Closes #8 at the expense of branching control flow in CLooG-generated code to check for parameters being large enough. Noepilog version now seems useless.