v3.9

This is the latest stable release using setup.py for building the Cython modules. Since the latest version, the Python installation scripts have been modernised. Notable changes:

• Moved installation to modern pyproject.toml format
• Simplified automatic search of Cython modules and compilation
• Updated to modern Sundials 7.6 using official repositories. This required a major cleanup of the cvode Cython wrapper
• Fixed a major bug in the NEBM that caused memory to grow substantially at every iteration step
• Added a new simple Conjugate Gradient method: Hubert's minimiser
• Added GA testing
• Updated documentation style

This release works with the latest Python 3.14.