BibFormat: improve display of deleted records
- For deleted records, do not display the following tabs: '/files', '/holdings', '/keywords'.
- Return only a minimal record (with controlfield 001, OAI ID and 980__c="DELETED" datafields) when formatting in 'xm' (with the nice consequence that XSL-generated outputs are also displayed as deleted).
- Use already existing method to output deleted records.
- Removed wash_wash_deleted_record parameter.
- Fixes #174