Implemented: * The name of the node should be Toetspeilen (plural instead of singular). * The node should be grey as long as not a single assessment level (toetspeil) has been calculated. As soon as at least one has been calculated, make it the standard (black) color. * Also did the previous for WaveHeight * The node Hydraulische randvoorwaarden must remain having an option to show the corresponding properties in context menu (that will open the Properties panel in case it is closed). Related to Issue [WTI-697]