started uncertainty visualisation experiments
Uncertainty visualisation:

- Uncertainty Manipulation tool window now basically works
- New VISAT plugin that generates two types of uncertainty fakes
Uncertainty visualisation:

- Uncertainty overlay now taken from uncertainBand.imageInfo
remove confidence bands
added confidence bands
inverted alpha ramp
UncertaintyManipulationToolView --> UncertaintyVisualisationToolView
Fix
Added mode option to uncertainty visualisation tool window
Added autogrouping
All four uncertainty modes implemented for demo
several ancillary roles are read from the image manager