Plagiarism & Reproduce updates:
-- Fixed bugreport:6994, Preseve only prevent to copy skill via Plagiarism, player still able to copy skill by Reproduce
-- Re-structure db/skill_reproduce_db.txt becomes db/skill_copyable_db.txt that allow you customize the avaiable skill to be copied
-- Removed 'copyskill_restrict' config from conf/battle/skill.conf, this setting can be set on db/skill_reproduce_db.txt
-- Enjoy structure of skill_copyable_db.txt! SkillName,Option{,JobAllowed{,RequirementRemoved}}

git-svn-id: https://rathena.svn.sourceforge.net/svnroot/rathena/trunk@17525 54d463be-8e91-2dee-dedb-b68131a5f0ec
* Fixed bugreport:8090, Frost Driver damages with overpower level because skill_lv reduction mistake.
* Added item_id on @whodrops's result for each item (avoiding confusion if the result is more than 1 items).

git-svn-id: https://rathena.svn.sourceforge.net/svnroot/rathena/trunk@17526 54d463be-8e91-2dee-dedb-b68131a5f0ec