Create a new version of an object

[ThomasPO]

Use case: Create a new version of an object in the repository
To do it, we need to refers a "colectica id" (or something like an URI) in Pogues to indicate on which object create the new version. In brief, we neek **a key between an object in Pogues and the same object in the repository.
If there is no key, it means: create a new object.

In addition, we need another information to say if we want to:

• create a new object
• create a new version
• reuse the same version of the object

At this time, the list of versioning objects is:
Sequence, Question, Declaration (we'll need an Id, see #21), Variable, CodeList
Maybe later: a Response, GotTo ?, Control?