several bugfixes in order to get the HLTGlobalTrigger decision safely into the ESD

several bugfixes in order to get the HLTGlobalTrigger decision safely into the ESD
- implementing copy constructor and assignment operator for class AliHLTGlobalTriggerDecision
  Even though the TClonesArray of participating trigger decisions is a member and not a
  pointer, this is not correctly handled
- Setting the trigger name of the HLTGlobalTrigger correctly from the default constructor.
  This makes sure the name is kept even though the AliESDEvent class uses placement new
  to reset the individual objects.
- ESDManager: correctly find the target object in the target ESD to copy over the data
- ESDManager: propagation of ESD is now enabled again
- AliHLTTriggerAgent: the trigger object has been added for every event instead of copying
  the content to the existig none