Support for evaluating the accuracy of the tracking

[jcfr]

References:

• https://github.com/skelobslab/JOVE_BVR_FootModelAndMarkerBased
• https://www.jove.com/t/63535/biplanar-videoradiography-dataset-for-model-based-pose-estimation

[NicerNewerCar]

Should this be a standalone module or be integrated as library code, similar to what I am doing with PR #12?

[bpaniagua]

Might be easier to do stand alone (just like the import modules you created from matlab) and integrate later on if needed. My 0.02

[NicerNewerCar]

MOVED TODO OVER TO #33

[NicerNewerCar]

Just need to package the new sample data and append a new section to the tutorial, on how to use this module.

[amymmorton]

• [ ] using Partial Volume Femur and Tibia tif generated from Pvol, use the .tra files from @jdholt04 (to be uploaded v.1.4)