Updated PrimeNet program and README. #360

Job	Run time
Mlucas (ubuntu-20.04, gcc)	1h 11m 17s
GpuOwl (ubuntu-20.04, g++)	2m 9s
Mlucas (ubuntu-20.04, clang)	1h 10m 19s
PrimeNet Linux (ubuntu-20.04)	7s
GpuOwl (ubuntu-20.04, clang++)	1m 51s
CUDALucas (ubuntu-20.04)	3m 26s
Mlucas (ubuntu-22.04, gcc)	1h 11m 29s
PrimeNet Linux (ubuntu-22.04)	6s
GpuOwl (ubuntu-22.04, g++)	2m 0s
CUDALucas (ubuntu-22.04)	2m 24s
Mlucas (ubuntu-22.04, clang)	1h 11m 34s
PrimeNet Linux (ubuntu-24.04)	8s
GpuOwl (ubuntu-22.04, clang++)	1m 52s
CUDALucas (ubuntu-24.04)	2m 48s
Mlucas (ubuntu-24.04, gcc)	1h 11m 38s
GpuOwl (ubuntu-24.04, g++)	2m 3s
Mlucas (ubuntu-24.04, clang)	1h 11m 35s
PrimeNet macOS (macos-13)	9s
GpuOwl (ubuntu-24.04, clang++)	1m 44s
PrimeNet macOS (macos-latest)	7s
Pylint	17s
Ruff	7s
PrimeNet Windows (windows-2019)	36s
PrimeNet Windows (windows-latest)	20s
	7h 30m 6s

Provide feedback