Re: Patch: ctype functions require 'unsigned char' args (ITS#1678)

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Written by Hallvard B. Furuseth and placed into the public domain.
This software is not subject to any license of the University of Oslo.
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Here are fixes for more places where the argument to ctype.h functions
should be in the range of `unsigned char'.

Explanation of the last patch (to schema_init.c:bvcasechr()):
TOLOWER() and TOUPPER() return values in the range of `unsigned char',
but bvcasechr() then compares those values with a plain `char'.  So I
convert the return values from TOLOWER()/TOUPPER() to `char' first.

Hallvard B. Furuseth <h.b.furuseth@usit.uio.no>, April 2002.