pyeq3 v12.6.1

Version 12.6.1 of pyeq3

• Fixes code output with line and plane extended version handlers
• Reformats the codebase with black
• Applies minor updates to the docstrings

v12.6.0

In this release, the following changes are made:

• Code restructured and reformatted
• Updates to code to for use with Python 3.9+
• Adds ability to add data as a numpy array
• Adds string output to the IModel class
• Fixes solved coefficients output for fixed or bounded solutions
• Adds basic sphinx documentation

Online documentation: https://pyeq3.readthedocs.io/en/v12.6.0