Needs work in normalizers, etc.

	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

Coverted LDAP_LOG macro to use subsystem ID int values instead of string values

Based upon patch submitted by Hallvard B. Furuseth <h.b.furuseth@usit.uio.no>.

   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.