#38

New Code added. 
Issues:
1. 
perspectives.multidimensional.PlanarProjectionViewer
Line 34: embedder = new SpringEmbedder(dm);
The constructor of SpringEmbedder is DistancedPoints. 

In the old versions there were code like:
embedder = new SpringEmbedder(t.getTable());

2. 
perspectives.tree.TreeData
perspectives.multidimensional.PlanarProjectionViewer

These classes overrides "propertyUpdated" where there is no propertyUpdated in their super class. 

In the old versions for viewer I guess there was a class named Point2Dviewer. 

3. In perspectives.tree package 
HierarchicalClusteringViewer, HierarchicalClusteringViewerFactory, TreeViewerFactory, TreeViewer is totally commented out. 

4. (Minor) Some of the classes have unused imports. 
5. (Minor) perspectives.three_d.UserNavigation is removed as it is not used and was generating compilation error.