fix: RMS error computed by register-points with -symmetric option used
fix: RMS error computed by register-points with -symmetric option used

schuhschuh/MIRTK,BioMedIA/MIRTK,BioMedIA/MIRTK,schuhschuh/MIRTK,schuhschuh/MIRTK,schuhschuh/MIRTK,BioMedIA/MIRTK,BioMedIA/MIRTK