Smoothing 3D orientations

Given the raw Pluecker coordinates estimating body direction found with flydra_analysis_orientation_ekf_fitter (and described here), we remove the 180 degree ambiguity (“choose orientations”) and perform final smoothing in the code in the module flydra_analysis.a2.core_analysis. Command-line programs that export this data include flydra_analysis_data2smoothed and flydra_analysis_montage_ufmfs. The command-line arguments to these programs support changing all the various parameters in this smoothing and orientation selection. Specifically, these parameters are:

                      minimum orientation quality required to emit 3D
                      orientation info
                      smoothing length of trajectory