Split Operation into Opheader and op

servers/slapd/acl.c

servers/slapd/back-monitor/init.c

servers/slapd/connection.c

servers/slapd/filter.c

servers/slapd/operation.c

servers/slapd/overlays/pcache.c

servers/slapd/overlays/syncprov.c

servers/slapd/passwd.c

servers/slapd/proto-slap.h

servers/slapd/sasl.c

servers/slapd/saslauthz.c

servers/slapd/slap.h

servers/slapd/slapacl.c

servers/slapd/slapauth.c

servers/slapd/syncrepl.c