move showdata.py out of src/root/nested/

Signed-off-by: Christoph Maier <cm.hardware.software.elsewhere@gmail.com>
crank baudrate up to 460800 baud

Signed-off-by: Christoph Maier <cm.hardware.software.elsewhere@gmail.com>
showdata.py moved into src/root/nested

Signed-off-by: Christoph Maier <cm.hardware.software.elsewhere@gmail.com>