DeltaAliasCollector#shrink() to shrink Iterator, Entry, etc.

that uses lowestCommonAncestor.
Rename CollaborationAliasCollector#sortAliasListByTimeStamp() from
sort().
Add CollaborationObjectCallGraph#sortTracePointByTimeStamp()and test
file.

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