Major Description
Harmony java5 TreeMap has great improvement on performance, however as java6 TreeMap has a great change in API and inner structure, we need to merge this two changes together.
The target is to complete all API changes as well as keep the performance improvement. A simple way here is keep the java5 level method as simple as it is and add new inner classes to extends the java6 methods.
After this merge I believe there are still some improvement to go.