global: more tests added

* Adds tests for final XML outputs for Elsevier, EDPS and APS.

* Adds test flag to get_record function in elsevier_package
  to not add the FFT tag because the file location
  is environment dependent and cannot be used for testing.

* Adds new escaping of ampersands in XML, along with tests.

* Removes references using refextract from tests.

Co-authored-by: Jan Aage Lavik <jan.age.lavik@cern.ch>
Signed-off-by: Georgios Papoutsakis <georgios.papoutsakis@cern.ch>