ENH: Implemented LayerStackItemModel (index+name) data query and signals; Improved StackedLayerModel signals to match QAbstractItemModel/LayerStackItemModel behavior.

ENH: Connected StackedLayerModel to LayerStackItemModel; Started implementing LayerStackItemModel; Improved StackedLayerModel.

ENH: Connected Raise/Lower layer; Implemented rotate up/down in layer-stack; Set main-window title with selected image basename.

ENH: Implemented Select next/previous layer in StackedLayerModel and connected it to/from image-view manipulator (keypress events only), renderer, widget.

COMP: Fixed compilation error on Windows platform due to use of std::pair(first, second) constructor initialization.

ENH: Separated ImageViewRenderer::UpdateScene() part from ::SetLayerStack() part; Removed old commented code.

REFAC: Folling up Larry Shaffer's patch: Changed activated slots by triggered slots in MainWindow classes of Code/Application/Monteverdi2, .../Mv2 and .../Mapla