Change the style of Mesh Contour

To make it visible immediately, it would be better to change the style of the Mesh Contour : square and green for instance.

changed milestone to %0.7.0

added feature label

assigned to @jean-marie.kerloch

mentioned in merge request !147 (merged)

added gui in progress labels

removed in progress label

mentioned in commit 6698fc90

closed with merge request !147 (merged)