- compatibility with lrcalc 2.1 (trac #31355)
- fix doctests for ipython-8.1 (trac #33170)
- fix doctests for scipy-1.8 (trac #33336)
- fix doctests for sympy-1.10 (trac #33398)
- fix doctests when sphinx is installed (trac #33585)
- use new package threejs-sage for 3d plots