[Todo] colored box to nodes about chartr HOT 5 CLOSED

The better way to do it would be with some keyboard shortcut. I would'nt like 
to have
a to complicated GUI.

could be alright with a 's' style option.
's' could : 
s+ : usual layout.
s+ : draw an outlined box arround the node.
s+ : bold the whole text in the node.
s+ : italic the whole text in the node.
s+ : usual layout.

Colored box is done. bold remains to be done.

I set it to fix. Bold is another issue, and will be assigned to another keyboard
shortcut. 'B'...