[m-dev.] ICFP Contest: Written parse_trace.m and dump.m

[Michael Day]

> One obvious bug in fix.m is that section 2 of the spec. points out that
> for div and mul, "32 bits is not enough for implementing these
> operations."  The quickest solution is probably to use the integer
> library rather than just int, although performance wouldn't be great

Implement div and mul as foreign_procs and use "long long".
Very simple, efficient, and no discrepancies.

Michael

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