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Add changelog
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maxnoe committed Sep 19, 2023
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Drop support for computing image parameters in ``CameraFrame`` (meters on the camera plane).
Going forward, ctapipe only implements computing image parameters in telescope frame (degrees on the sky).

* ``ctapipe-process`` and ``ImageProcessor`` no longer have options to chose between ``CameraFrame`` and ``TelescopeFrame```
* All image parameter functions do not support inputs in length units anymore
* If using these low-level funtions directly in your code, you will need to transform your camera geometries into ``TelescopeFrame``
using ``geometry.transform_to(TelescopeFrame)``. This requires a correctly set ``frame`` attribute with a ``focal_length`` on the ``CameraGeometry``. If reading files using the ``SimTelEventSource`` or ``HDF5EventSource``, this is already the case, io plugins might need to adapt.

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