Merge pull request #2198 from fredrik-johansson/jordan #1678

Job	Run time
macOS-M1, Clang (x3)	8m 18s
Ubuntu GCC, Code Coverage (x10)	28m 48s
GCC build regression check (no tests)	1m 57s
Ubuntu GCC with NTL (assert, x2)	8m 1s
Alpine Linux, musl, 32-bit (assert, x1.5)	14m 5s
MinGW GCC (x0.5)	11m 15s
MSVC (x1)	10m 3s
Nemo.jl	17m 26s
Ubuntu Clang, BLAS and examples (x5)	12m 32s
	1h 52m 25s

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