D-Net

- Added a global average
- Added averages per country/organisation/publisher
- Added an info message for the users on the top of the Statistics page
- Statistics page now public for all users

Fixed a problem with the maps in the statistics page and added some comments for the tables

Added 'accounting processing' in the list of default statuses for accounting csv

Changed the wording on the first section (numbers) of the statistics page

Statistics menu appears only to moderators

Added support in the funding request workflow for book chapters

Added on emore section in the Statistics page

Added graphs for amounts of money spent and changed the structure of the statistics page

fixed an non existing error

- Made typesafe again
- Fixed a couple of NPEs