Define LDAP_TLS_PORT as 636, the default port for LDAP over raw TLS

Add option definitions for TLS

Add digest md5 codes to -lldap/-lldap_r (work in progress)

Modify ldap_result to assert returned error is not an one reserved
for API use.
Modify frontend LDAP operation routines to return an error code.
The returned value will be used to determine if an unsolicited notification
should be sent to the client.
Need to review returned error codes.  Namely some LDAP_PROTOCOL_ERROR
will like need to be changed (as they will cause unsolicited notifications).

specific which methods may be used.  This will facilate development
of a slapd config directive "passwordMethod ..." to specify which
methods should be allowed.

Leave only LDAPv2+ and LDAPv3.

  !defined( DOS ) && !defined( MACOS )
Add detection for read & recv/send for later use.

used to fetch the pw_passwd which is than passwd to crypt().
getspnam() is used instead of getpwnam() when available.
Added configration detection of pw_passwd, shadow.h, getpwnam()
and getspnam().

ith --enable-modules. GLib v1.2 or higher is required.

s/setup.exe/setup.txt/g
create workspace for testing purposes.

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

backout previous nt changes (actually, just don't include nt_svc.c)

	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_/

that replace old static routines.

Fix LDAP_MEMORY_DEBUG realloc size bug, thanks Alex.

Fix install of ldap_schema.h to use $(srcdir)

Fix LDAP_HI 0x377 vs 0377 bug.