frontend stuff moved into a database structure, essentially to allow overlays to be processed before database selection; passes all tests (ITS#3080)

misc other cleanup

result to client.

instead of getting a timestamp at the end. This makes it possible for
slurpd to sort the log later.

(slapi_x_XXX is still reserved for exported functions that are not part
of the SLAPI specification)

1) simultaneous operation of multiple active sync replication threads
2) cookie management for individual sync replication thread
   (include rid=%3d to the slapd cookie command line option (-c))

- BDB context csn codes moved to a separate function in back-bdb/ctxcsn.c

- currenty works for refreshOnly mode of LDAP Sync
- Context CSN for add / modify is implemented
- code for delete / modrdn / refreshAndPersist will be soon committed

	 slap_mods_opattrs(), slap_mods_check(), slap_mods2entry()

- conf file processing udpate
- misc updates

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

order to prevent the operation from being passed to the backend. It
need only return a non-zero error code.

re-add objectClass pretty routines