Add a fix for mutually-recursive infinite things

So now it will solve correctly for
  x = y + 1
  y = max(0, x + 1)

I also added in tests for this (and a slightly different form with `x`
going through another variable, `z`, for indirection).

The tests will also stop now after five seconds of execution. If they
can't be solved in five seconds then they're considered a failure.

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