- new interface beween MUON objects (track/cluster/digit) and ESD objects (track...

- new interface beween MUON objects (track/cluster/digit) and ESD objects (track/cluster/pad)
--> removed most of dependences towards ESD objects in the MUON code

Two ways of using this interface:
1) converting individual objects using static ESD <--> MUON conversion methods
2) loading an entire ESD event into the interface and using the member methods to access MUON objects

Philippe Pillot