D-Net

Changed the stats api URL property to point to beta stats

Added R&D expenditure in country page

A correction in the labels of the overview cards in the home page

Small corrections in some numbers

Fixed some small css issues and added a beta label to the logo

Added some fixes for the country page handling data

Created the indicator tables for the open science tab of the europe page

Finished the charts for the open science tab of the country page

Finished the charts for the overview tab of the country page

Finished the charts for the open science tab of the europe page