* Fixed some Manhole skill related:
* Shouldn't be removed by Crazy Weed, Fixed#580
* Hell's Plant should ignores target under Manhole effect, Fixed#566.
* Fixed#536, Neutral Barrier shouldn't miss magic attack and ranged attack that ignores flee.
* Fixed#522, Change Material always check the first produce line that matches the item/product requested. Also removed some reduntant checks.
* Fixed#568, Gentletouch Cure shouldn't heal Emperium and BG's Barricades.
* (Attempt to) Fixed#533 and fixed#212, Ground Drift damage calculation.
Signed-off-by: Cydh Ramdh <cydh@pservero.com>
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