calc_inertia_conesolid
                        Moment of inertia tensor of a solid circular
                        cone pyramid
calc_inertia_cylhollow
                        Moment of inertia tensor of a hollow cylinder
calc_inertia_cylsolid   Moment of inertia tensor of a solid cylinder
calc_inertia_ellcone    Moment of inertia tensor of a solid elliptical
                        cone - end of purple notebook derivation
                        verified in green
calc_inertia_ellcyl     Moment of inertia tensor of a solid elliptical
                        cylinder Reference:
                        https://apps.dtic.mil/sti/pdfs/AD0274936.pdf
calc_inertia_ellipse    Moment of inertia tensor of solid ellipse CG or
                        a half ellipse centered on the base
calc_inertia_platerect
                        Moment of inertia tensor of a flat rectangular
                        plate - assumes thickness is approximately zero
                        Reference:
                        https://apps.dtic.mil/sti/pdfs/AD0274936.pdf
calc_inertia_platetri   Moment of inertia tensor of a flat triangular
                        plate
calc_inertia_pyrasolid
                        Moment of inertia tensor of a solid square
                        pyramid Reference:
                        https://apps.dtic.mil/sti/pdfs/AD0274936.pdf
                        All outputs are based on an origin at the
                        centered point on the base
calc_rot                A 3x3 rotation matrix constructed by projecting
                        the new axes onto the original system. Likely
                        results in rotation about all axes.
calc_univec             Determine the unit vector of any input vector
clean_pts               The identified peripheral and joint 3D
                        positions.
combine_inertialprop    Combine body and wing inertial components.
compute_feat_inertia    Compute the inertia of the individual feathers
dat_bird_curr           Bird specific morphology dataset
dat_bone_curr           Wing bone specific morphology dataset
dat_feat_curr           Flight feather specific morphology dataset
dat_id_curr             Identification variables for current
                        configuration
dat_mat                 Material properties.
density_optimizer       Optimize torso section densities
kronecker_delta         Kroneckerdelta function
massprop_birdwing       Calculate the center of gravity and moment of
                        inertia for a halfspan wing.
massprop_bones          Bone mass properties
massprop_feathers       Feather mass properties
massprop_head           Head mass properties
massprop_muscles        Muscle mass properties
massprop_neck           Neck mass properties
massprop_pm             Point-mass mass properties
massprop_restbody       Calculate the center of gravity and moment of
                        inertia for the head, neck, torso and tail.
massprop_skin           Calculates the mass properties of skin or
                        tertiaries
massprop_tail           Head mass properties
massprop_torso          Torso and leg mass properties
orient_feather          Determine the feather orientation
parallelaxis            Parallel axis theory
plot_CGloc              Plot the center of gravity of each component
rotx                    A 3x3 rotation matrix allowing rotation about
                        the x-axis. Constructed using a cosine rotation
                        matrix where the rotation angle in degrees is
                        measured counterclockwise allowing positive
                        rotation under the right hand rule.
store_data              Store data from the inertia calculations in
                        long format
structural2VRP_feat     Transform feather specific inertial properties
                        to current position
