update DataObjID
fixed typo in DataObjIDProperty, updated release notes, added DataHandle placeholder prototype class
- DataObjID: various classes used for DataObject and DataHandle identification
- DataObjID: holds a unique key for an object in the store, with an internal representation as a hash for fast lookup. syntax is either Gaudi EDS path style "/path/to/object", or ATLAS style with (ClassID,"key") or ("ClassName","key") Collections of DataObjIDs are unordered_set<DataObjID,DataObjID_Hasher> typedef to DataObjIDColl
- DataObjIDProperty: jobOpt Property handler for DataObjID and DataObjIDColl
- DataHandle: prototype placeholder for DataHande class