- point marker is now a (selectable) 3D sphere
- point marker default size is customizable via display options dialog
- new entry in the DB tree context menu: "Toggle materials/textures"
- new options for display:
	* point marker size (see above)
	* histogram bacground color
	* label color
- limits for auto-decimation are now:
	* 10M. points for a cloud
	* 2.5M. faces for a mesh
- bug fix: SF scale is now renderded by the 'Render to file' tool