* Closing #5304

	* Avoiding synthetic access.
	* Avoiding potential NPEs.
	* Minor JavaDocs fixes.
	* Added some TODO tasks.

BETA: Fixing Frintezza instance bug when a monster self-destruct should trigger onKill thanks '''tukune'''

BETA: Moved part of 20110831update.sql to 20110831maintenance.sql because should be executed only one time (manually by server admins and only updating from a L2J Server before 2011/08/31) not in every update or it will screw the date in "createDate" column at character table.

	* Unhardcoding most of skill ids
	* Fixed some typos
	* Added missing system messages
	* Added some TODO: comments
	* Decreasing range of shot skill broadcasts

	Thanks Battlecruiser for first implementation.

        * ExRegMax packet was sent to the Owner of a pet/servitor when it get healed by overtime effect but it shouldn't.

BETA: The service fee required for exchanging regular Pet equipment for higher-level equipment has been reduced by 50%.

BETA: Removed "update" boolean from Ant Zip Task, because it doesn't build the Zip file properly (doesn't remove the old files), and few other changes included for database_installers.