[m-rev.] for review: avoid using some "keywords" 5

[Zoltan Somogyi]

I have wanted to make this change for a long time,
whenever I got the confusing error messages the log
message refers to, but such times are the *only* times
when you cannot make this change: if you do it in the
same workspace, you make your half-done job harder,
while if you do it an another workspace, you are guaranteed
merge conflicts.

The only part that needs review is the naming scheme
for the replacement function symbols in prog_data.m
and hlds_goal.m: do people agree that they are an
improvement over the old state of things?

Zoltan.
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