BUG: When deleting a layer fallback to Projection=None only if there are no more images left in the layer stack.

ENH: Moved mvdUseInDebug() and mvdUseInRelease() macros into otbConfigure.h.in as otbUseInDebug() and otbUseInRelease().

BUG: MANTIS-1248: Fixed StackedLayerModel::Delete() does not reset current & reference layer indices.

Revert "WRG: call itkNotUsed macro to fix unused parameters"

This reverts commit d619eaf4.

Conflicts:
	Code/Application/Monteverdi/mvdMainWindow.cxx

ENH: Added last picked pixel-information into StackedLayerModel (optim: reduces std::vector<> memory (de)allocations due to copies).

ENH: Upgraded StackedLayerModel to desynchronize current and reference layers; (Mv2) Split main tool-bar into main- and render-toolbars; (Mv2) Added reference-layer combo box to tool-bar.

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

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