Fixed Bug #7193 and ...

http://hercules.ws/board/tracker/issue-7193-monsterhp/
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Follow up 0f4a50d13538c3e5d3ca4d3822f92217c8da0479 re-introduced mob_max_skilllvl
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Updated some packet intro dates (special thanks to yommy! <33)

Signed-off-by: shennetsind <ind@henn.et>