WebSearch: protect new records

• New records, i.e. records just inserted and not yet assigned to a collection by webcoll, are now automatically protected, and only the superadmin or the corresponding author(s) (as indicated in the MARC) are allowed to access them.

• Streaming of attached files is also authorized only to superadmin and the authors.

• Streaming of attached files is now always authorized to authors, no matters the protection of the file (unless the file is hidden).