BibAuthorID: ORCID support for rabbit

* Rabbit tries to match papers to profiles
  by ORCID, after trying to do so with an
  INSPIRE id.
* The ORCID is located in $__j fields with
  the prefix of 'ORCID:'.

Signed-off-by: Artem Tsikiridis <artem.tsikiridis@cern.ch>
We should in fact extract the ORCID number of `ext_id` to match the storage format in aidPERSONIDDATA. That is return `m.group()` if `m = re.search(r"(\d{4}\-){3}\d{4}", ext_id)` is not None.