Store Richness of Information score details

With this commit the scores of each field is stored in the document.
This will help to further evaluate the metrics.

Signed-off-by: Konrad Reiche <konrad.reiche@gmail.com>
Display intermediate scores with tooltip

This commit embeds tooltips into the Richness of Information metric
view. They are used to display the intermediate scores.

Besides that I forgot to reset the score details variable which lead to
aggregated results of different documents.

Signed-off-by: Konrad Reiche <konrad.reiche@gmail.com>