remove cruft

servers/slapd/back-meta/TODO

-* Short term:
-
-- add missing functions (FIXED)
-
-- review per-target error handling
-
-- dn cache and cache exploitation to refine the candidate selection (?) (FIXED)
-
-- review the group stuff (also in back-ldap!) (FIXED)
-
-- review the attribute stuff (also in bacl-ldap)
-  note: this requires changing the acl stuff that checks "dnattr"
-  to call a backend specific function that determines what need 
-  be done to retrieve the "dnattr" attribute from an entry.
-
-- rework compare and bind to attempt to operate on all candidate entries
-  while checking at most one succeedes (FIXED, check bind)
-
-- clear previously bound targets when the bind is repeated (FIXED)
-
-- apply new logging to all the stuff (also in back-ldap)
-
-* Long term:
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-- distributed entries
-