add lemmas to util/list
- Added a few lemmas to
util/list
that are needed for POET - Added "subinterval" to the wordlist
- Dropped dependency on Coq 8.11, Coq 8.12, ssreflect 1.10, and ssreflect 1.11
Edited by Sergey Bozhko
util/list
that are needed for POET