[m-rev.] for review: user-defined comparison

[Ralph Becket]

This reminds me of something I've considered doing for a while, namely
adding the following to builtin.m:

:- pred T < T.
:- mode in < in is semidet.

X < Y :- compare((<), X, Y).

and so on for (=<), (>), (>=) and getting rid of (<) etc. in int.m and
float.m.

This would allow us to use inequalities on all terms, not just ints and
floats.

Would this lead to any grief?

- Ralph
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