BibEdit: import CrossRef data
- Adds BibEdit input field for DOI on record/edit page.
- Adds module crossrefutils which gets XML from CrossRef page and transforms it into MARCXML.
- Adds crossref2marcxml.xsl to translate XML from CrossRef into MARCXML.
- Adds function to normalize author name. Removes spaces between initials.
Reviewed-by: Javier Martin Montull <javier.martin.montull@cern.ch>