clean up release branch

hp4155/ADU for double gate devices/double_gate_ADU.py

...U for double gate devices/double_gate_ADU_interface.ipynb

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

hp4155/ADU for double gate devices/lib/interface.py

hp4155/ADU for double gate devices/lib/measurements.py

hp4155/memristor (Version 1.0)/help.py

hp4155/memristor (Version 1.0)/memristor.py

hp4155/memristor (Version 1.0)/memristor_buttons.ipynb

hp4155/memristor (Version 2.0)/help.py

hp4155/memristor (Version 2.0)/memristor.py

hp4155/memristor (Version 2.0)/memristor_buttons.ipynb

hp4155/memristor (Version 3.0)/help.py

hp4155/memristor (Version 3.0)/help_pulse.py

hp4155/memristor (Version 3.0)/memristor.py

hp4155/memristor (Version 3.0)/memristor_buttons.ipynb

.../memristor pulsed (Version 1.0)/constant_pulse_test.ipynb

hp4155/memristor pulsed (Version 1.0)/help.py

hp4155/memristor pulsed (Version 1.0)/help_new.py

hp4155/memristor pulsed (Version 1.0)/interface.py

hp4155/memristor pulsed (Version 1.0)/pulse.py