ENH: Set/Get number of threads for Whitaker evolution class

Change-Id: I0d6b33dff275a6e125ceb3f31b712d449ba6576c
BUG: Non-square images mesh not specified correctly

Test checks if the mesh is correctly connected

Measures the average surface area per cell

Change-Id: I57cfab90e87d9d578fe2ee16290797b9f5c3542c
Merge branch 'master' into LevelSetv4Visualization

Conflicts:
	Modules/Segmentation/LevelSetsv4Visualization/include/itkVTKVisualize2DLevelSetAsElevationMap.h
	Modules/Segmentation/LevelSetsv4Visualization/test/itkVTKVisualize2DLevelSetAsElevationMapTest.cxx

Change-Id: I16abdb35e4bd11e74e0bc5a9a3369cc817cc0c84
ENH: Set the scaling factor of the level-set function

Change-Id: I07ecb24202056bcf79495c88c3fbf97ebffff65f
Merge topic 'LevelSetv4ScalingVisualization3'

a233ee8 ENH: Set the scaling factor of the level-set function
Merge topic 'LevelSetv4Visualization'

cd6d260 Merge branch 'master' into LevelSetv4Visualization
9ec414e BUG: Non-square images mesh not specified correctly
Merge topic 'LevelSetv4Multithreading'

2aa0763 ENH: Set/Get number of threads for Whitaker evolution class