Adding setup.py for conventional packaging/installation#56

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dmikushin wants to merge 6 commits intoesa:masterfrom

Commits on Aug 7, 2020

Adding setup.py for conventional packaging/installation. Embedding pagmo and pybind11 as submodules
dmikushin
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Commits on Aug 18, 2020

Commits on Oct 20, 2020

Adding NO_EXTRAS to resolve LTO errors in Python module linking
dmikushin
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Commits on Oct 21, 2020