[R6RS] Procedures that depend on Unicode character classification

[Michael Sperber]

I'd like to suggest that the procedures that depend on the Unicode
character classification, i.e. the ...-ci... procedures, the
{char,string}...case procedures, and `char-general-property' procedure
be moved to a separate library.

They're by far not as frequently used as most of the others, and
leaving them out of a program might save signficant space, as the
tables they need to operate tend to weigh in roughly at the order of
100kbytes (depending on the compact representation chosen).

-- 
Cheers =8-} Mike
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