multiple precision with BIGNUM/gmp/ulong

configure.in

include/ldap_pvt.h

servers/slapd/ad.c

servers/slapd/add.c

servers/slapd/at.c

servers/slapd/attr.c

servers/slapd/back-meta/search.c

servers/slapd/back-monitor/operation.c

servers/slapd/back-monitor/proto-back-monitor.h

servers/slapd/back-monitor/rww.c

servers/slapd/back-monitor/sent.c

servers/slapd/back-passwd/search.c

servers/slapd/back-sql/add.c

servers/slapd/back-sql/api.c

servers/slapd/back-sql/delete.c

servers/slapd/back-sql/entry-id.c

servers/slapd/back-sql/init.c

servers/slapd/back-sql/modify.c

servers/slapd/back-sql/modrdn.c

servers/slapd/back-sql/schema-map.c