pass `groupInfo`, `group` and `totals` objects to the aggregator.init() mathod for use in the aggregator -- this is used by complex aggragators which require intel about being applied to groups/subgroups or plain items, for example.
pass `groupInfo`, `group` and `totals` objects to the aggregator.init() mathod for use in the aggregator -- this is used by complex aggragators which require intel about being applied to groups/subgroups or plain items, for example.

GerHobbelt/SlickGrid,GerHobbelt/SlickGrid,GerHobbelt/SlickGrid