Please ensure referential consistency for source uuid

[ntoll]

Hi,

Submission objects have the attribute, source_url which contains the uuid of the parent source as the final item in a path.

Reply objects also have the same attribute, source_url containing the uuid of the parent source as part of a path. However, the Reply object also has the attribute source_uuid.

Please, when there is some notion of a foreign-key like reference to another object via a path can the class also include an attribute to that named uuid (e.g. source_uuid). It just makes things neat, consistent and we know that it's the SDK that's containing the logic to transform the raw URL into the associated uuid.

Thanks (PR coming soon). :-)