Changed authorization for Messprogramm. * Added 'readonly' flag * Only user with function '4' and the corresponding 'netzbetreiber' are allowed to edit. * User authorized to create a 'probe' are allowed to generate proben.

{
    "stammdaten.datensatz_erzeuger": [{
        "id": 1000,
        "bezeichnung": "Testbezeichnung",
        "netzbetreiber_id": "06",
        "mst_id": "06010",
        "datensatz_erzeuger_id": "06"
    }]
}