CollaborationLayoutクラスの追加．

Create CollaborationObjectCallGraph to merge ExtractedStructure and add
relatedPoint, getCallTree().
Create IObjectLayout to create merge delta layout.

Change MagnetRONFrame to use DeltaAliasCollector  instead of
DeltaAliasTracker.

Add IObjectCallGraph, MagnetRONViewer is parent of DeltaViewer,
CollaborationViewer.