pidstore: fix method call bug
OpenAIRE: write xml to shared tmp instead of tmp

* Write XML file to tmp-shared instead of tmp so that bibupload
  can read the file no matter the host it is executed from.
OpenAIRE: add task to update a DataCite DOI.
BibFormat: fix OAI_DC export issue
OpenAIRE: remove unused sign-up page
OpenAIRE: fix unicode error cascading

* Fixes an issue with the email address being in unicode, that would
  cause generated MARCXML to be unicode, and raise an encoding error.
OpenAIRE: fix autocomplete issue in journal field
BibFormat: add oai_datacite format