Add stats&filtering by runtime

[nliautaud]

Each entry has [data-total-runtime], so getting the data is straightforward.

But howto UI/UX ?

• Which graphs could give the best infos in relation to the others ?
• How is it manipulated by the user to filter the data ?
• Are the data gathered, like the years are treated by decades ?
• Is there a limited range of runtimes filtered by default ?

The most useful feature may be a toggle/select to show/hide/switch between short works and feature-length works. It could work in conjunction with a runtime graph.