Enable choice of term ordering for REST #522
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This PR allows the user to change the termination ordering for use in REST with a flag:
--rest-ordering. Available options are:rpo: Recursive Path Ordering (default)kbo: Knuth-Bendix Orderinglpo: Lexicographic Path OrderingfuelN: Only applyNconsecutive rewriting steps in a row (i.efuel5,fuel10, etc).Information about REST technique and different term orderings are described in sections 3 & 4 in the REST paper: https://s3.us-west-1.wasabisys.com/zg-public/paper.pdf
Related PR: ucsd-progsys/liquidhaskell#1930