coin dupe prevent

[tsowl]

when you have 2.15~4.29M platinum then you and dupe them just simply take them out of bank and put them back

zone/client_process.cpp

-	value = amount_to_take * CoinTypeCoppers(mc->cointype1);
-	amount_to_add = value / CoinTypeCoppers(mc->cointype2);
+	amount_to_add = amount_to_take * ((float)CoinTypeCoppers(mc->cointype1) / (float)CoinTypeCoppers(mc->cointype2));

	// the amount we're adding could be different than what was requested, so
	// we have to adjust the amount we take as well
-	value = amount_to_add * CoinTypeCoppers(mc->cointype2);
-	amount_to_take = value / CoinTypeCoppers(mc->cointype1);
+	amount_to_take = amount_to_add * ((float)CoinTypeCoppers(mc->cointype2) / (float)CoinTypeCoppers(mc->cointype1));

[cavedude]

Added to revision 995.