New release: Version 1.6.1

[pyxel-detector-framework]

Hello Pyxel users,

The Pyxel team released version 1.6.1 ! 

This release brings a number of bugfixes and documentation improvements. A single release candidate (1.6rc0) was made to fix some issues.

 The JSON Schema files for the 'stable' and 'latest' are respectively located in https://esa.gitlab.io/pyxel/pyxel_schema.json and https://esa.gitlab.io/pyxel/pyxel_schema_latest.json. 

And detailed How-to guide about JSON Schema is available. 

Add new models `load_detector` and `save_detector` for each Model Groups to load/inject or to save/extract a `Detector` object to/from a running pipeline. 

Add new model group `data_processing` with a new model `statistics`. 

See more changes in the changelog.