This PR implements disequality splitting and non-chronological
backtracking for the `grind` linarith procedure.
```lean
example [IntModule α] [LinearOrder α] [IntModule.IsOrdered α] (a b c d : α)
: a ≤ b → a - c ≥ 0 + d → d ≤ 0 → d ≥ 0 → b = c → a ≠ b → False := by
grind
```
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| .. | ||
| bench | ||
| compiler | ||
| elabissues | ||
| ir | ||
| lean | ||
| pkg | ||
| playground | ||
| plugin | ||
| simpperf | ||
| .gitignore | ||
| common.sh | ||
| lean-toolchain | ||