* Added documentation on ancient code in mob_skill_db.txt, where skills will be treated as 'global' if a negative mob ID is specified.
* Follow-up r16694, reverted to official behavior (bugreport:6545)
git-svn-id: https://svn.code.sf.net/p/rathena/svn/trunk@16695 54d463be-8e91-2dee-dedb-b68131a5f0ec