Solution ending exactly at 16:30 must be yellow with 0 days delay.

This uses a symlink ! I am afraid this does not work on windows

This error message was displayed for all errors, such as timeout or
server errors.
We only want to catch errors in jIO.put

Although this is still disabled

Set short ids, set some CSS on nodes (use circle shape), use "name"
everywhere, use "priority" to order some properties and tab (I did not
make it perfect, just reordered a bit).