Unicode superscripts for simple exponents

[Nathan Alison]

I think it's a quite ugly to see

 2

x

I'd much rather have

x²

Subscripts for numerical powers would make a lot of simple expressions prettier, I think. We'd still have the current syntax for more complicated expressions.

[Aaron Meurer]

I agree. Probably there should be some option to do it the current
way, but the default should be the best. There is also a limited set
of superscript letters that we can use (all the latin alphabet except
q according to http://en.wikipedia.org/wiki/Unicode_subscripts_and_superscripts).
Feel free to open an issue for this, or a pull request implementing
it.

Aaron Meurer

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