Repackaging spam

python 3.10, python 3.11 checks and build, drop 3.6 (as per https://en.wikipedia.org/wiki/History_of_Python)
Last 0.7 series release with current state
update setup.cfg into setup.py with buildtools
splitting into modules (DIC, rpi, label, others?), what's in the "main" module? Look at napari for module example
investigate GMSH to replace CGAL in label
windows pip build on EPFL XaaS?

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