Fix small issue with std::sort calling a comparator that does not respect strict_weak_ordering #874
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Those still compile in most environments since the symbols get imported transitively, but relying on that is considered a bad practice. It is also necessary to compile MiniZinc with Bazel.
…equirements. With the current code, if there are two id Expressions: `id1` and `id2` and one non-id expression `expr`, we could have `id1 < id2` and `id2 < expr < id1`. This CL makes ids to be ordered before non-ids. Also remove call to Expression::equal(), which also made a checker complain the ordering was not strict, probably because it is not transitive.
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