Add trajectory complexity measures - implement straightness index #514
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movement/trajectory_complexity.py - The module containing the compute_straightness_index function
tests/test_unit/test_trajectory_complexity.py - Unit tests for the straightness index
examples/trajectory_straightness.py - Example
movement/init.py - Updated to expose the new function
This is the implementation of just compute_straightness_index as mentioned by @niksirbi in Methods to measure complexity of trajectories (paths) #406 Open #506