improve limits handling and consistency; return "Admin limit exceeded" instead of "Unwilling to perform"

- implement pagedResults abandon by setting size=0
- misc code cleanup

LDAP Control Extension for Simple Paged Results Manipulation

contributed by Lynn Moss <lynnmoss@us.ibm.com> (ITS#2189)

applied with changes.

Converted ch_malloc and ch_calloc calls to SLAP_MALLOC and SLAP_CALLOC.

Converted ch_malloc and ch_calloc calls to SLAP_MALLOC and SLAP_CALLOC.

Converted ch_malloc and ch_calloc calls to SLAP_MALLOC and SLAP_CALLOC.

Converted ch_calloc and ch_malloc calls to SLAP_CALLOC and SLAP_MALLOC.

and autoconf); #include "ac/string.h" instead of <string.h>

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

Converted ch_calloc calls to SLAP_CALLOC.

Converted ch_malloc, ch_calloc and ch_realloc calls to SLAP_MALLOC,
SLAP_CALLOC and SLAP_REALLOC respectively.

Converted ch_malloc, ch_calloc and ch_realloc calls to SLAP_MALLOC and
SLAP_CALLOC in add_value/add_value_one functions and propagated errors to
all functions that use these functions.

now that we normalize to lower case. Should be merged into 2.1.