QPID-4597: Java performance tests now support visualisation of timeseries data.
Refactored ChartBuilder hierarchy to reduce duplication, and renamed several classes to make them more intuitive.
Added timeseries chart definitions in perftests/etc/c/timeseries/.

git-svn-id: https://svn.apache.org/repos/asf/qpid/trunk@1449342 13f79535-47bb-0310-9956-ffa450edef68