Import file path "dat_path" returns wrong path

[bartkroese]

Found when trying to run kite_kinematics_3d.py, the path dives into the parent one too many times.

Line 15 in kite_kinematics_3d.py:

dat_path = Path.cwd().parent / 'data'

should be:

dat_path = Path.cwd() / 'data'