D-Net

When updating a person, keep the original object that contains the id

Added number of paid requests per publication

Added some more numbers in the Statistics page

Used descending order as the default in the requests lists

Added a button in existing funding requests and monitor funding requests to add doi and repository info

- 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