Undelete document

Once a document was deleted, we can restore most information except document files:

SELECT * FROM  t_document WHERE doc_id_c = 'b9a538d2-906f-4566-b00d-ee4aa70d8ff8';
UPDATE t_document SET doc_deletedate_d = NULL  WHERE doc_id_c = 'b9a538d2-906f-4566-b00d-ee4aa70d8ff8';