Map tension data to optical tracking

# Smoothing algorithm
Need to be fairly careful about the smoothing used. Defaulting to Gaussian 8 without an option to be modified in `defaults` for now.
The default for `smoothdata()` kills a fair bit of the flexion angle


# Accelerometer Calibration
Hard coded extension to be 267 degrees (`z = z - 267`). This is a blind assumption and needs to be validated.

No file or test is named. Start by locating the smoothing and accelerometer-calibration implementation referenced in the issue, then compare the Gaussian-8 behavior and hard-coded 267-degree extension against expected tracking data; done means those choices are validated or corrected.

Written by the indexing model from the issue text.