Added _version.py file required by the python build.
Added _version.py file required by the python build.

percival-detector/odin-data,percival-detector/odin-data,odin-detector/odin-data,odin-detector/odin-data,odin-detector/odin-data,odin-detector/odin-data,odin-detector/odin-data,odin-detector/odin-data,percival-detector/odin-data,percival-detector/odin-data,odin-detector/odin-data,percival-detector/odin-data,percival-detector/odin-data,percival-detector/odin-data