keyboard master

Allow full navigation from keyboard in devices supporting event handlers, plus fix some bugs.

Navigate and print

This release is the first public release but a 1.0 has been previously in extensive use in our team.

It introduces intuitive navigation with the mouse when possible (not all devices on Mac and Linux can support events handlers) and falls back to the default, less easy navigation when not possible.

It also introduces the possibility to "print" the current zoomed version of the plot without leaving the zoom interface.