Improvements for double gates software part 1

.../ADU for double gate devices_version_3/double_gate_ADU.py

...le gate devices_version_3/double_gate_ADU_interface.ipynb

hp4155/ADU for double gate devices_version_3/lib/help.py

...55/ADU for double gate devices_version_3/lib/interface.py

...ADU for double gate devices_version_3/lib/measurements.py

...DU for double gate devices_version_3/plotly_example.ipynb

...DU for double gate devices_version_3/test_interface.ipynb