bug#14353: Implement array-fold and array-fold-all

[Jez]

Right now there are no library functions for folding over arrays (or bytevectors, etc.) This implements them. fold-all produces a single value regardless of the number of dimensions of the array; it is implemented on top of array-for-each. array-fold produces an array of rank n-1, where n is the rank of the original array.

I'll write up documentation if the code looks acceptable.

Regards,

Jez

0001-Implement-array-fold-and-array-fold-all.patch
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