[m-rev.] for review: use enum to identify impl defined literals

[Zoltan Somogyi]

For review by anyone.

Also, would people object if I made the code that converts int, float
and string term functors to cons_ids actually check that they have
no arguments? Catching mistakes such as 8("abc") only during
typechecking generates not-all-that-helpful error messages
that complain about 8 not being a function.

Zoltan.
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