add GaudiKernel/EventIDRange class
Adds an EventIDRange class to GaudiKernel, which holds 2 EventIDBase objects
add sort methods to EventIDBase, to sort by Run/Event, Timestamp, and Lumi/Event
Adds an EventIDRange class to GaudiKernel, which holds 2 EventIDBase objects
add sort methods to EventIDBase, to sort by Run/Event, Timestamp, and Lumi/Event