Use strings as identifiers for ISimulationData
SImplify registerData interface and fix Particles
Fix DataConnector, update Copyrights, simplify

 - fix iteration in DataConnector
 - simplify interfaces (get id directly from passed data)
 - update copyright headers (name, year)
 - fix Radiation plugin
 - simplify hdf5 in InitialiserController
Remove (unsupported) xml initialization
Merge pull request #232 from f-schmitt-zih/topic-dataConnStr

Use strings as identifiers for ISimulationData