network editor viewing

[fjenett]

Students often get lost in the network editor. Some ideas on how to improve that experience:

• add "show whole network" button
• add overview interface showing which area you are zoomed into (like with maps applications or some image editors) … this could also be something simple like a compass that points to the center of the network graph or render node
• maybe also a "jump to render node" button
• add reset view as button to editor window