Qelim fixes #106
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Qelim fixes #106
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Fixes #105. Before, we did qelim with operands that could be infinite. We now disallow that because it leads to unsoundness (see linked issue). Instead of checking that the LHS operand is a constant, we now check that it is finite only. Thus, we now allow expressions with variables inside. As a consequence, quantifier elimination after prob. choices with variables inside now works. I also added support for traversal of the algorithm through parenthesis expressions. Those don't come from vcgen, but only from user-written code.
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Fix for #105, and fix for another typo. Since this code is pretty easy to get wrong, I'd like a second pair of eyes on the fixes.