Save strategy should preserve feature.url when transforming

[pwr]

feature.url is currently not being carried over to the clone when transforming coordinates

[pwr]

patch to pass over feature.url when transforming

[elemoine]

Feature.Vector doesn't have a url property in its prototype, which kind of explains why Strategy.Save does not clone it. But the update() and delete() methods of Protocol.HTTP do look at feature.url, so it may indeed make sense to have Strategy.Save take url into account. I think we should also add a url property in the prototype of Feature.Vector and document that it can be useful when using the HTTP protocol.

[elemoine]

(In [9752]) Save strategy should preserve feature.url when transforming, p=pwr,me, r=me (closes #2215)