. adding upgradednformat utility to each server instance.
. adding 91upgradednformat.pl for in-place-upgrade.
. implementing ldbm_back_upgradednformat sharing the import/
. adding a new DBVERSION ID "dn-4514" for the upgraded db.
. fixing access logs (delete.c and modify.c)
. fixing compiler warnings.
. fixing memory leaks.
. fixing a bug in syntax plugin to free strings.
. adding templates for plugin id, version, vendor, and description,
which are needed for the online upgrade.
. dbversion_write takes an additional bit flags, which indicates
which extra DBVERSION strings are written to the DBVERSION file.
It was introduced for the upgrade tools not to intervene each
other's tasks (e.g., dn2rdn for converting entrydn to entryrdn
and upgradednformat for upgrading the DN format).