Minor cleanups + fix an int overflow bug #666

Job	Run time
Doxygen check	15s
Compute matrix	4s
Verify Dev Containers / Verify devcontainers	11s
CUDA11.8 gcc / amd64 / Build gcc11/C++17 / Build gcc11/C++17	4m 6s
CUDA12.5 gcc / arm64 / Build gcc12/C++17 / Build gcc12/C++17	4m 23s
CUDA12.5 gcc / amd64 / Build gcc12/C++17 / Build gcc12/C++17	4m 2s
CUDA12.5 gcc / amd64 / Build gcc13/C++17 / Build gcc13/C++17	4m 33s
Verify Dev Containers / List devcontainers	3s
Verify Dev Containers / cuda11.8-gcc11	59s
Verify Dev Containers / cuda12.5-gcc13	1m 11s
Verify Dev Containers / cuda12.4-gcc12	58s
Verify Dev Containers / cuda12.5-gcc13	1m 2s
Verify Dev Containers / cuda12.5-gcc12	1m 8s
CUDA12.5 gcc / amd64 / Test gcc12/C++17 / Test gcc12/C++17	6m 15s
CUDA11.8 gcc / amd64 / Test gcc11/C++17 / Test gcc11/C++17	6m 23s
CUDA12.5 gcc / arm64 / Test ${{ inputs.test_name }}	0s
CUDA12.5 gcc / amd64 / Test ${{ inputs.test_name }}	0s
CI success	1s
	35m 34s

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