Description of problem:
In RHQ 4.10, we put a in place a new implementation for metrics data aggregation that addressed performance problems. With the new implementation came some settings to configure and tune the performance. This work was tracked under bug 1064110. These settings were exposed as resource configuration of the RHQ Server's measurement subsystem.

I had a lengthy discussion with Jay about where these setting should be managed. As he pointed out, since they are global, i.e., shared by all servers, they ought to be stored as system settings. 

In addition to making the aggregation settings system settings, there are some other settings we should add. Currently the starting times to look for raw, 1 hr, and 6 hr data to be aggregated is hard coded. See bug 1114202 for details. They should be configurable as well.

The second part involves additional settings that we need 

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