In reassocation, don't reassociate additions

It was serving no purpose, and was messing up the associativity of
balance on sub.  I believe it was originally there because I thought I
had to handle 19 * (a * b + c * d) -> (19 * a) * b + (19 * c) * d, but
this case doesn't show up, and so I never wrote the code to handle it,
but also never removed the code to parse additions into lists (thereby
losing associativity information).

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