Brings improvements

Balance
- No more empty weight
- Left weight should not go to right scale
- Reducing the size of half

Morpion
- Correction de l'évaluation des lignes

Train
- Add <1 and <0.1 options
Signed-off-by: Didier Bathily <didier.bathily@njin.fr>

Navigation palette: thumbnails isn't refeshed after application added to the page

Conflicts:
	src/board/UBBoardController.cpp
	src/domain/UBGraphicsStrokesGroup.cpp