rework op/rs structures to deal with opeartional attributes

servers/slapd/back-bdb/operational.c

servers/slapd/back-bdb/search.c

servers/slapd/back-ldap/search.c

servers/slapd/back-ldbm/operational.c

servers/slapd/back-ldbm/search.c

servers/slapd/back-monitor/operational.c

servers/slapd/back-relay/op.c

servers/slapd/back-sql/compare.c

servers/slapd/back-sql/operational.c

servers/slapd/back-sql/search.c

servers/slapd/backend.c

servers/slapd/backover.c

servers/slapd/overlays/refint.c

servers/slapd/overlays/rwm.c

servers/slapd/overlays/unique.c

servers/slapd/proto-slap.h

servers/slapd/result.c

servers/slapd/sasl.c

servers/slapd/saslauthz.c

servers/slapd/search.c