[m-rev.] for post-commit review: reserve type names

[Zoltan Somogyi]

After an earlier diff, there was in-principle agreement that
reserving type names such as "int" is a good idea. This
implements that decision.

At the moment, the four builtin types are int, float, string
and character. "char" is not reserved; it is defined as a
synonym for "character" in library/char.m. Given that
virtually all the code we have that deals with characters
uses "char" and not "character", it may be a good idea
to either switch them around (make "char" the builtin type
and "character" a synonym for it) or to reserve both names
for the builtin type. However, the bootstrapping process
for either change would NOT be trivial, and is probably
not worth it.

Zoltan.
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