Patch release v0.4.3

What's Changed

• CI: Update manifest to include npz data files, don't use editable install for nox make_docs by @clonker in #233
• plot energy surfaces by @clonker in #234
• Network plots by @clonker in #236
• plot fluxes by @clonker in #237
• Fix preprocess data call in SINDy by @clonker in #240
• Fix shape of empty count models by @MaaikeG in #239
• proper exception handling in trajectory-generating openmp block by @clonker in #242
• better error handling for trajectories dataset by @clonker in #243
• [ci] fix python 3.8 by @clonker in #244
• Convergence warning bugfix by @MaaikeG in #245
• Fix the bug by @MaaikeG in #246
• Contour and density plot utility functions by @clonker in #247
• py38 by @clonker in #249
• [setup] exclude examples, docs, devtools when packaging by @clonker in #250
• Var_cutoff can be disabled in covariance koopman models. Fixes #254. by @clonker in #255

Full Changelog: v0.4.2...v0.4.3