* get list of feeds needing aggregation
* exit if none
* attempt to take aggregation lock, exit if another aggregation is happening
* fork a child process to do the aggregation
* get list of feeds needing aggregation
* exit if none
* attempt to take aggregation lock, exit if another aggregation is happening
* fork a child process to do the aggregation
* drop aggregation lock
* force rebuild of sourcepages of feeds that were aggregated
* exit checkconfig and continue with usual refresh process
* drop aggregation lock
* force rebuild of sourcepages of feeds that were aggregated
* exit checkconfig and continue with usual refresh process