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Repeated arithmetic negation

Applies to ✅ Open Source Edition   ✅ Express Edition   ✅ Professional Edition   ✅ Enterprise Edition

The negation unary operator reverses itself, when called repeatedly, meaning that redundant NEG() operators can be removed.

Using Settings.transformPatternsNegNeg, the following transformations can be achieved:

-- With Settings.transformPatternsNegNeg active, this:
FROM tab;

-- ... is transformed into the equivalent expression:
  x,  -- -(-(x))
  -x, -- -(-(-(x)))
FROM tab;


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