[FIX] project: access task without project

Allow access to task without a project defined if the user is follower.
Fixes #3450
[FIX] product: pricelist shouldn't convert uom when not needed or incompatible uom types

Otherwise the Search More view will crash for example for sale order line because it will fetch the price of all products and then try to convert uoms for pricelist rule application without checking uom compatibility
[IMP] doc-ws: prepend setup code when copying from a snippet
[FIX] product: name_get of product.attribute.value

name was confusing for bom and product if the value of the attribute is display without the attribute name
added key in context to keep the previous behaviour (e.g. in product view where the attribute name is present)
[FIX] mrp: The attribute on bom lines is not filtered in function of the selected product template