Made it so Fan.Merge doesn't need to tolerate left-hand-null.
Renamed advise components.
SubPixel as scoring (instead of coloring) transfer.
UI Tweaks for advise.
Split old sub-pixel into 'edge boost' and a new 'sub-pixel' based on variance.
Overlay-style edge detection and sub-pixel analysis.
Updated 'present'
Region-based limit working.
Merge branch 'advise' into zoom-limit
Limit/Zoom region working DRAFT.  UI is not obvious and some corner cases are unhandled.
Improved spreader.  Covered some corner cases in zoom/limit.
Merge branch 'master' into zoom-limit
Merging master