[m-rev.] for review: add builtin 64-bit integer types -- part 2

[Zoltan Somogyi]

I just got four test failures that look related to this diff.

As the attached bootcheck output shows, each of the
four test cases that failed test uint64 operations.
All test failures consist of a crash of the *compiler*,
with the contents of the attached ABORT file
being written directly to the terminal (not stdout or stderr;
both went to Out.feb3).

I remembered something from my review, and had a hunch.
Changing the 20 to 21 in the C foreign proc for uint64_to_string
in string.m fixes the problem. The problem was that UINT64_MAX
has 20 decimal digits, one more than INT64_MAX.

I am committing this fix.

Zoltan.
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