Update computation of particle rest volume #169

Job	Run time
Check formatting of pySplashsurf crate	10s
Build wheel for documentation and tests	3m 19s
Run stub generator	1m 6s
Build wheels for Linux x86_64	3m 25s
Build source distribution	13s
Build wheels for macOS x86_64	3m 44s
Build wheels for macOS aarch64	3m 16s
Build wheels for Windows i686	4m 52s
Build wheels for Linux armv7	3m 17s
Build wheels for Linux i686	5m 4s
Build wheels for Linux aarch64	3m 31s
Build wheels for Windows x86_64	5m 1s
Build wheels for Windows aarch64	5m 1s
Run pytest	2m 51s
Build documentation	28s
Publish to PyPI	0s
Read the Docs trigger	0s
	45m 18s

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