* Standardization of new Upgrade Weapon Enchants script. (follow-up 5debd8c)
* Fixed some bugs related to Nidhoggur's Nest. (bugreport:7990)
* Follow-up ba6b57b:
- Added 'is_clientver' command to Navigation system function.
- Documented @item change.

Signed-off-by: Euphy <euphy@rathena.org>