Hopefully not controversial...

Add a button that will iterate over all the parts, and turn any resources whose flowState is "off" to "on".

Flowstate is controlled by the small button next to the resource in the right-click menu that switches from a "play" triangle to the "stop" triangle.
Restore viewport after rendering VesselView.
Merge pull request #80 from MOARdV/master

Hopefully not controversial...