Start implementing data retrieval page
Add and use a new minimized js file.

This is actually a mix of dropdownmenu.js and map.js which should be kept in sync with this file. The big gain does not come from the minimization as much as from the reduction of the number of files.
Resize the logo to 120px and use the new file.

This reduces just a little bit the filesize.
Add dropdown menu for raw data.