a more reasonable sorting of complex numbers #2740

Job	Run time
Alpine Linux, musl, 32-bit (assert, x1.5)	6m 20s
macOS-x86 Clang with BLAS (x2)	12m 12s
GCC build regression check (no tests)	1m 5s
macOS-M1, Clang (x3)	4m 35s
MinGW GCC (x0.5)	8m 41s
MSVC (x1)	26m 12s
Nemo.jl (temporary branch)	6m 50s
Ubuntu Clang with examples (x5)	4m 48s
Ubuntu GCC, Code Coverage (x10)	6m 12s
Ubuntu GCC with NTL (assert, x2)	4m 28s
	1h 21m 23s

Provide feedback