increase mini-gmp base support to 62

[Niels Möller]

"Marco Bodrato" <bodrato at mail.dm.unipi.it> writes:

> But the proposed patch adds constants that enlarge (too much in my
> opinion) both the source and the binary of this small-size implementation.

I also prefer the conciser version without the large table.

> I attach an alternative patch. Please revise it.

Looks good. Only detail I don't quite like is the variable name
"lowercaseoffset". Maybe "value_of_a" (since it's the value of the
digit 'a')? Or at least add an underscore or two, lowercase_offset.

Thanks,
/Niels

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