WIP: Still working with the Affine transforms.
Fixed line selector ignoring view tranform.  Added 'unused' annotations to suppress warnings.
More 'unused' annotations...maybe this is a bad idea...
Two-phase zoom works...but its jumpy.
Addred repaint on layout change on control layout change.
Merging in control refresh fix.
Moved draw/view transform dichotomy to TransferDisplay only
Delayed zoom until mouse-up.
Provisional pixel-paralell-transfer progress reporting.
Removed pixel-parallel task-level reporting, was wrong in a lot of cases.  Moved to generic 'working' message.