[js/explorer-v2][s]: add support for specificying breakdown to aggregator.
[js/explorer-v2][s]: add support for specificying breakdown to aggregator.

RCGTDev/openspendingjs,openspending/openspendingjs-old,openspending/openspendingjs-old,RCGTDev/openspendingjs,openspending/openspendingjs,openspending/openspendingjs,openspending/openspendingjs-old,openspending/openspendingjs,openspending/openspendingjs-old,openspending/openspendingjs,RCGTDev/openspendingjs,RCGTDev/openspendingjs