Support a decent subset of eqn(7) in MathML.

This has basic support for positions (under, sup, sub, sub/sup) and piles.
It *does not* support right-left grouping (among many other things), e.g.,

  a sub b over c sub d

Which it will interpret, for the time being, as

  a sub { b over { c sub d } }

instead of

  { a sub b } over { c sub d }

However, left-right grouping works fine.

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