Updated PrimeNet program and README. #361

Job	Run time
CUDALucas (ubuntu-20.04)	3m 10s
PrimeNet macOS (macos-13)	7s
CUDALucas (ubuntu-22.04)	2m 3s
GpuOwl (ubuntu-20.04, g++)	2m 22s
PrimeNet macOS (macos-latest)	7s
PrimeNet Linux (ubuntu-20.04)	7s
CUDALucas (ubuntu-24.04)	3m 30s
GpuOwl (ubuntu-20.04, clang++)	1m 58s
PrimeNet Linux (ubuntu-22.04)	5s
GpuOwl (ubuntu-22.04, g++)	1m 58s
PrimeNet Linux (ubuntu-24.04)	5s
GpuOwl (ubuntu-22.04, clang++)	1m 48s
Mlucas (ubuntu-20.04, gcc)	1h 10m 44s
Pylint	17s
GpuOwl (ubuntu-24.04, g++)	2m 3s
Mlucas (ubuntu-20.04, clang)	1h 11m 41s
GpuOwl (ubuntu-24.04, clang++)	1m 48s
Ruff	6s
Mlucas (ubuntu-22.04, gcc)	1h 10m 24s
PrimeNet Windows (windows-2019)	45s
Mlucas (ubuntu-22.04, clang)	1h 11m 26s
PrimeNet Windows (windows-latest)	34s
Mlucas (ubuntu-24.04, gcc)	1h 11m 35s
Mlucas (ubuntu-24.04, clang)	1h 11m 7s
	7h 29m 50s

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