add generic number of coordinates

[lukasheinrich]

mode:

ScanRequest
    - PointRequest1
        - PointCoordinate: {name: X, value: 1.03}
        - PointCoordinate: {name: Y, value: 1.05}
    - PointRequest2
        - PointCoordinate: {name: X, value: 2.03}
        - PointCoordinate: {name: Y, value: 2.05}
    - PointRequest3
        - PointCoordinate: {name: X, value: 3.03}
        - PointCoordinate: {name: Y, value: 3.05}