[v3] Docs for ctype

[jlquinn@optonline.net]

Since I was working on ctype, I decided to conjure some docs for it.  The only fly in the ointment is that __ctype_abstract_base is where all the generic functions are defined, so ctype<charT> refers to it for member docs.

2003-12-18  Jerry Quinn  <jlquinn@optonline.net>

        * include/bits/locale_facet.h
        (__ctype_abstract_base,ctype<charT>,ctype<char>,ctype<wchar_t>):
        Document.