Multi-located content : allow multi-threads

[lolautruche]

With datatype implementation (see #2), threads would logically identified by ContentObjectID, but it should also be possible to identify by the NodeID. Multi-located content would have 2 options :

1. One thread per content. This way, the same comments would appear in every locations.
2. One thread per location.

This should be configurable in the content attribute edit form, with default value stored in content class attribute.

See Disqus variables doc on disqus_identifier

[bdunogier]

If one thread per content is used, it should:

• use the main Url Alias by default
• allow the editor to choose with alias is used by disqus (disqus_url variable)

[lolautruche]

@bdunogier Your comment is all about disqus_url variable, right ?

[bdunogier]

Yes.