[IMP] product,purchase: Make the vendor price configurable on the variants too.

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Purpose
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There are some confusion about the use of the vendor price and the cost price.
Moreover, in the purchase app, the RFQ should take the variant vendor price, if one is set

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Specification
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Add a clear tooltip on the Cost field (standard_price) : "The cost price is used for valuate stocks or to asses the price of manufacturing a product. The purchase orders are fetching the vendor prices."
In the simplified view, add the vendor cost o2m : https://drive.google.com/a/openerp.com/file/d/0BxqHe5rtIxY0LVZHZXFWcWFHckk/view?usp=drivesdk
Variant vendor prices should be indenpendant from each other, and from the template ones.
In the purchase app, when creating an RFQ : the system fetches the variant cost price (from vendor o2m), if no price on variant, it takes the vendor price on template.

NB: fp request

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