Merge pull request #426 from jcarpent/topic/sparse

.github/workflows/conda/environment_macos_linux.yml

.github/workflows/conda/environment_windows.yml

.github/workflows/jrl-cmakemodules.yml

.github/workflows/linux.yml

.github/workflows/macos-linux-conda.yml

.github/workflows/reloc.yml

CHANGELOG.md

CMakeLists.txt

cmake

include/eigenpy/details.hpp

include/eigenpy/eigen-from-python.hpp

include/eigenpy/eigen-to-python.hpp

include/eigenpy/eigenpy.hpp

include/eigenpy/fwd.hpp

include/eigenpy/numpy-type.hpp

include/eigenpy/register.hpp

include/eigenpy/scalar-conversion.hpp

include/eigenpy/scipy-allocator.hpp

include/eigenpy/scipy-type.hpp

include/eigenpy/sparse/eigen-from-python.hpp