Development

[lmoresi]

This is needed to get the binder running again.

[lmoresi]

All the recent fixes from JC plus the LM fixes to binder (making the kdtree switchable).

[Copilot]

Pull Request Overview

This PR addresses compatibility issues and improves debugging capabilities to get binder running again. The changes primarily involve API parameter fixes, class renames, debugging enhancements, and fallback implementations.

• Fixed API parameter names from deprecated to current versions
• Added debugging output and better error handling for mesh operations
• Switched to fallback KD-tree implementation due to pykdtree hanging issues on binder

Reviewed Changes

Copilot reviewed 6 out of 7 changed files in this pull request and generated 7 comments.

Show a summary per file

File	Description
src/underworld3/swarm.py	Fixed deprecated sqr_dist parameter to sqr_dists in KDTree query calls
src/underworld3/function/_function.pyx	Added array handling for single point evaluations and consistent output behavior
src/underworld3/discretisation.py	Enhanced debugging output, fixed variable references, and improved mesh initialization
src/underworld3/ckdtree.pyx	Renamed class, updated query interface, and added new RBF interpolation implementation
src/underworld3/init.py	Switched from pykdtree to ckdtree fallback implementation
docs/user/Notebooks/2-Variables.ipynb	Added test cells for mesh functionality validation

[lmoresi]

Apply recent fixes in dev to main branch (to ensure binder is running at the time we announce new release)