Reduce the footprint of the image
Hamish has indicated that a target of 3.2GB image may work better for usb sticks of 4 GB, partly to leave adequate space for users to save their own data. Calculating a 2x compression factor that means we would need to trim 500-600 MB from the current virtual machine to reach that goal. I think targeting 4.0 release for this feature would be good. This may coincide with simplification of the example datasets into one common pool and reducing size of some samples like the postgres medford database.