* Added warning message when addtimer script is failed, as bugreport:8459 http://rathena.org/board/tracker/issue-8459-addtimer-command-should-report-an-error-if-it-hits-max-eventtimer/
* Follow up 0f7ecd0, 308ee6c, 1f29f50
* Little source documentation updated on script.c

Signed-off-by: Cydh Ramdh <house.bad@gmail.com>