[IMP] product : Improve variant usability

- Add an option in the General Settings : Use product variant.
- If this option is disabled : don't show any reference to variants
- When going on the product template view, and clinking on the stat button under the tab Variants,
  the form view should display only the information related to the variant
- Fields moves from product_template to product_product :  weight, volume, cost price,
- DO NOT display these fields on the product_template if there are more than 1 variants.
- In product variant view, set some fields readonly and add a link to edit it from Template.

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