Added Sigma and Pi (FStar.SigmaPi.fst*) to ulib. #3691
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Added Sigma and Pi (FStar.SigmaPi.fst*) to ulib. It uses the fixed range style (#x #y .. (i:interval x (y+1))) to keep the proofs simple. It refers to the wiki for named lambda proofs, which may be needed anyway but are avoided in the basic definitions.