logilab-doctools #4448384 [rst2dbk] Add bibliographic field for document reference [in-progress]

When describing a document in ReST, we want to give the reference of the document (such reference is unique). No standard bibliographic field allows us to define this piece of information.

prioritynormal
typeenhancement
done in0.7.0
load0.200
load left0.200
closed by<not specified>
patchAdding processing for additional bibliographic field containing the document reference [applied]