arg to tool_entry_open comes too late for back-bdb to use.

-test017-syncreplication

can create compound filters containing multiple filters. Have proposed API
to Sun DS team; until then it should likely be marked LDAP_DEVEL (if SLAPI
is not entirely marked as such already).

Fix slapi_filter_dup() crasher.

Add slapi_x_filter_append(), as a replacement for slapi_filter_join() that
can create compound filters containing multiple filters. Will propose API
to Sun DS team; until then it should likely be marked LDAP_DEVEL (if SLAPI
is not entirely marked as such already).

- add "updatedn" to the replication specification
- return referral to update to the slave server

directly instead of going thru filter_candidates. Use hdb_ function prefix
in dn2id.c to avoid ambiguities...