replace calls to dnNormalize2 with calls to dnNormalize

consolidated into the Operation structure. All reply parameters
are consolidated into the new SlapReply structure. Most operations
now have identical call signatures... Changes are not #ifdef'd,
revert to -r NO_SLAP_OP_BLOCKS if necessary to back out.

Replaced with bi_entry_get_rw.
Implemented for back-bdb, back-ldbm, back-ldap.

hence, s/LDAP_OPERATIONS_ERROR/LDAP_OTHER/

			================
Written by Hallvard B. Furuseth and placed into the public domain.
This software is not subject to any license of the University of Oslo.
			================

back-passwd uses getpwent() and setpwfile(), which use static data.
It needs a mutex to make sure these operations can complete without
interference from another back-passwd call.  Here is a patch.

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

			================
Written by Hallvard B. Furuseth and placed into the public domain.
This software is not subject to any license of the University of Oslo.
			================

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.