[m-rev.] for review: reversing operator priorities

[Zoltan Somogyi]

This implements what we discussed recently.

The diff contains several "XXX OPS" markers noting further
opportunities for improvement; I would like your feedback on these.
I would like to resolve the ones in ops.m before commit; but intend
to leave the others for a later commit.

We probably should keep the old form of the ops module around,
possibly named old_ops.m or prolog_ops.m, for anyone who
wants it. I will make the necessary changes, including to NEWS,
once we get to a concensus on this.

For review by anyone.

Zoltan.
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