v0.14.0

• Allow state references to be cloned into normal states (useful for FFS results).
• Add Python typing for FFS results.
• Distinguish stored states and number of configurations for FFS surfaces.
• Make FFS state references more useful.
• Fix rayon use in Python (parallel execution).

v0.13.1

• Allow Python compilation without ui.
• Fix attachment order tracking.
• Fix tube canvas N/S boundaries.
• PyO3 0.21, with new Bound API.
• Fix python tests.

v0.13.0

Significant Python refactoring, numerous improvements.