1. **Add Script for Operating on Unit Quaternions:**
- Introduced a script for various operations on unit quaternions.
2. **Update README:**
- Revised README to include usage instructions for the unit quaternion operations script.
3. **Add Script for Converting Unit Quaternions to Euler Angles in Relion:**
- Added a script to convert unit quaternions to Euler angles (`rlnAngleRot`, `rlnAngleTilt`, and `rlnAnglePsi`) used in Relion.
4. **Update README:**
- Updated README to cover the new conversion script for unit quaternions and Euler angles in Relion.