[m-rev.] for review: replace four "safe num digits" tables with one

[Zoltan Somogyi]

For review by Julien. I used an awk script to merge the four old tables
into the new table, so you don't need to check every entry in it.

Unless you object, I also intend to move all the get_num_X_digits_in_Y
and fill_string_with_X macros from the foreign_decl block at the start
of the implementation section into a new file in the runtime, and
replace them a #include of that new file.

I also intend to move the implementations of the builtin_type_to_string
and string_to_builtin_type kinds of predicates (including the string to int
predicates) to new submodules of string.m, named maybe string.from_builtin
and string.to_builtin. (string.to_string is already taken.)

The objective of all this is to reduce the size of string.m (which is now
the largest library module by far)  and keep it manageable.

Zoltan.
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