RFC 3687. For now, both the attribute and assertion values are considered
as RDNs. Refer to ITS#3207 to find related discussion.

initial/final string settings from any string settings.

  need to add special handler to allow (objectClasses=top) to work

	catch error in validation/pretty functions

now described in RFC 3698.  Would be good to implement these.

on patch submitted by Mark Ruijter <openldap@siennax.com>.
This addresses (hopefully) ITS 2702, 2703, 2719, 2771.
Additional work:
	fix extraneous frees in libldap/getdn.c x509 rewrite routine
	indexing

usage - necessary to use larger types for interop with a certain client
that would expect the assertion (attr:1.2.840.113556.1.4.803:=2147483648)
to match a signed value (eg. -2147483646).

There are probably better / more portable solutions; review appreciated.

Should resolve ITS#2664.

No longer accept initial and trailing spaces in these syntaxes.