added lber_types.h.nt, lber_types.h.in
removal of NULLxxx internal macros (in favor of NULL).
ch_free added to slapd,slurpd/ch_malloc.c
#define free ch_free (should be removed after s/free/ch_free/g) in proto-slap.h
ch_malloc and friends use ber_memalloc and friends
ldap_defaults.h incorporates non-generated ldapconfig.h values.
ldap_config.h.in is new template for autoconf generated defaults
(namely directories and paths)
ldap_config.h.nt, NT template (must be manually copied)
s/<ldapconfig.h>/<ldap_defaults.h>/
s/DIRSEP/LDAP_DIRSEP/ & s/DEFAULT_/LDAP_/