[m-rev.] diff: simplify code constructing pred names

[Zoltan Somogyi]

The diff is not really worth reviewing, but it does raise
a question. At the moment, there are several modules
that construct new pred names (this diff affects two of them).
There is no overall pattern, and what partial pattern does exist
is, in my opinion, flawed, for reasons documented in the XXXs
added by this diff.

Would anyone object if I moved all the code that constructs
new pred names to a new module, pred_name.m? This seems to me
to be a necessary first step to imposing an overall naming scheme.
(Whose implementation would of course require updating all
the modules, both C and Mercury, that want *parse* pred names.)

Zoltan.
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