ot_gv has a redundant configuration setting for order-status

ot_gv has a redundant configuration setting for order-status; needs to be removed #73
Also added MODULE_ORDER_TOTAL_GV_SPECIAL to allow GVs to be on specials.
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I wonder whether this might cause troubles if the ot_gv module isn't already installed, since when one tries to install it the module will attempt to insert this value which already exists...