Unification of workflow input nodes

Important changes:

• consistent naming conventions for workflow input nodes:
  • computer options: options (respective entries are always: 'queue_name', 'resources', 'max_wallclock_seconds', 'custom_scheduler_commands' , 'use_mpi')
  • names for JuKKR code input nodes : kkr (KKRhost), voronoi, kkrimp
  • if there is only one RemoteData input node for the workflow, the name should be remote_data, for more than one: remote_data_{...}
  • general workflow parameter input nodes should always be named wf_parameters
  • the impurity information node for impurity embedding is always named impurity_info
• consistent naming conventions for workflow output nodes:
  • general information about the workflow run should be stored in a workflow_info ParameterData node
• fix auto tests