 V-2-6-0-0-S:

  [+] Added 'publication request' task type. Task is automagically created after the document changes to the 'Request publication' state.

  [+] sendMail() and checkAndDeliver() creates now one mail message for user from all documents he did not receive yet.
           sendMail() being used for delivery emails and documents workflow processing.
           checkAndDeliver() being used for delivery emails to users who receive dispatches once a week or month. It does not process workflow actions for documents.

  [+] Added 'publication request' task type. Task is automagically created after the document changes to the 'Request publication' state.

  [+] Directive task has 'Report task failure' response
      
      Docstrings updated

  [+] Virtual Document object type is renamed to the Business Procedure

  [+] Business Procedure has a special filter that allows to see only entries editable by the authenticated member

