Dynamic load balancing

[dtmoodie]

Node's should list if they can accept a lower resolution input.
There should be a way of accessing if an input image is downsized to allow rescaling of output if needed.
If a node is taking too much time, automatic image resizing should occur.
Node's should also list if they affect the output, so if a particular node such as GoodFeaturesToTrack operates on a downsized image, it can list that it doesn't affect the output. Thus the next node down the line can use the full sized image from prior to GoodFeaturesToTrack.