BibEdit: prevent deletion of managed DOIs fields
- Check if the fields requested to be deleted contain a managed DOI.
- Check if the record requested to be deleted contains a managed DOI.
- Introduces CFG_BIBEDIT_INTERNAL_DOI_PROTECTION_LEVEL in order to control the behaviour regarding deletion of managed DOIs: Ask user confirmation before deleting, forbid deletion or simply proceeed. (closes #1445)
Signed-off-by: Jerome Caffaro <jerome.caffaro@cern.ch>
Acked-by: Javier Martin Montull <javier.martin.montull@cern.ch>