Release note for the iEBE-MUSIC v1.2

This is the official release of the iEBE-MUSIC framework v1.2.

Major new features:

• Enable thermal photon emission and spin polarization calculations
• Add a new afterburner_type to choose different hadronic transport models
• Download individual code packages with specific commit numbers
• Add model parameter files for individual publications for data reproducibility
• Introduce multi-stage data reduction and add data analysis scripts
• Add cluster support for various NSF XSEDE machines
• Improve checkPoint implementations on OSG

Full Changelog: v1.1...v1.2