Athena++ 19.0-dev

Release 19.0

In this version, we have switched to CalVer (calendar versioning). Many changes have occurred since the previous version 1.1.1, but the highlights are:

Added

• Passive scalars
• Extend automatic and manual load balancing beyond AMR
• General equation of state capabilities for non-ideal gases
• Improved performance
• Implement RKL1 Super-Time-Stepping
• Add fourth-order hydrodynamics solver
• Add HDF5 reader and pgen for initializing from HDF5