RELEASE: Version 0.43.0 #577

Job	Run time
Pure-Rust feature set	2m 59s
Rustfmt	8s
Feature combinations (cargo-hack)	13m 54s
Clippy (all targets)	7m 12s
O3 (BLAS / LAPACK via OpenBLAS)	14m 21s
plot (pyo3 + matplotlib)	1m 18s
No-rand core (wasm32)	57s
Default features	58s
	41m 47s

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