Move Visualization/Data selector in Group By form in Menu

This frees the space on top of the main area, which will
next be occupied by the number of authors selected / total.
Move total authors selected / total authors on top of visualization
Expand the list of authors in CSV from the start in data pane
Remove categories from the data pane

The selected categories are already filtered in the select list
for the corresponding filter, like all other categories.
Capitalize important words in visualization/data pane selector
Add 'Authors' after total to clarify