elsevier_package: adds FFT marc field to upload fulltexts for consyn
Merge pull request #9 from GiorgosPa/add-FFT

elsevier_package: adds FFT marc field to upload fulltexts for consyn
aps_package: add APS conversion package

* Adds a new package to convert aps harvested files to
  MARCXML format.

Tested-by: Jan Aage Lavik <jan.age.lavik@cern.ch>
aps_package: various fixes

* Updates the script to not add the FFT tag.

* Adds a new case for reference harvesting with no
  'mixed-citation' tag.

* Adds a new case for proc-type references.

* Adds a new case for thesis-type references.

* Adds a new case for report-type references.

* Fixes _get_doi function.

* Handles multiple references with the same label

Signed-off by: Georgios Papoutsakis <georgios.papoutsakis@cern.ch>
aps_package: fix reference extraction

* Handles unstructured text in references.

* Adds external links in references.

* Kwalitee fixes.

* Adds a special case to handle references
  from journal 'J.High Energy Phys.'.

Signed-off by: Georgios Papoutsakis <georgios.papoutsakis@cern.ch>