Implement bda.plone.shipping.interfaces.IShippingItem.shippable and consider at appropriate places. Introduce IShopShippingSettings.default_shipping_item_shippable and use as default for IShippingItem.shippable. Remove IShopShippingSettings.include_shipping_costs, flag gets calculated now from IShippingItem.shippable. Remove cartdata.CartDataProvider.include_shipping_costs, it's implemented now on base class.
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Add ``cartdata.CartDataProvider.max_artice_count``.
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CURRENCY_LITERALS import changed
Check against order total value instead of payment method in ``CheckoutSettings.skip_payment``.