[m-rev.] for review: add uint->uintN conversions

[Zoltan Somogyi]

For review by anyone. I would particularly like someone
to check the Java and C# foreign procs, and I am interested
in people's opinions on the name of the new op in uint64.m,
since for that type, from_uint, det_from_uint, and cast_from_uint
are effectively the same operation.

Zoltan.
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