schema engine updated (but not schema routines so things don't run yet)
	nvalues mostly populated, enough for tests 0-2 to pass
	schema routines needs lots of work
	modify/mods codes needs lots of work

Use LDAP_SLISTs instead of per-struct list management for schema structs
misc cleanup and lint removal

name is an objectClass.

Add no-op control (needs backend implementation)
Updated modify password extended option API
Kludged control infrastructure to support frontend only controls

Based upon code submitted by Steve Omrani <somrani@us.ibm.com> (ITS#1525)

there is an error.)

Added error checking to str2anlist; if the attr name doesn't match
any attribute or objectclass the offending attr name is displayed.

Fixed bug in do_search eating up controls.

Use typedefs for all backend functions, to minimize work in future API
updates. (back-*/external.h will never need updating in the future.)

treated as a request for all required and allowed attributes of the class.
This allows:
	ldapsearch (objectClass=*) inetOrgPerson
	(requests return of all attributes of inetOrgPerson)
and
	ldapsearch (objectClass=*) extensibleObject
	(requests return of all attributes, e.g., "+" "*")

ad_find_lang() to search an AttributeType for a given language variant.
(Will be used in back-bdb/back-ldbm index code...)

trival other cleanup.

   Changed AttributeDescription.{ad_cname,ad_lang} to struct berval everywhere
   Deleted ad_free() everywhere
   Added ad_mutex to init.c

The AttributeDescriptions are in a linked list hanging off of the
corresponding AttributeType.