slightly rework user/operational attributes handling (including fixing a bug in the logic of the previous change to backend_operational()); cleanup; more improvements to slapo-rwm and back-relay

no normalizer, a_nvals = a_vals.

added attr_merge/value_add functions that dela with single attribute; bervals for '*', '+' and '1.1' made available

liblber:ber_bvarray_{add,free}.

   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.

  routines, such as distinguishedNameMatch, to be sure.

	(2.5.4.0=2.5.6.0) works!	ie: (objectclass=top)