AVRO-614: Improve Trace frontend UI

Review Request #716 - Created Aug. 24, 2010 and updated

Patrick Wendell
old-avro git
avro
philip
Improves frontend for avro trace by adding graphs.
Refactoring is covered by existing tests. New logic (list sampling) includes a unit-test. Not quite sure how to test the client-side graphing stuff.
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