sci-overlay/sci: Added an ebuild for pyAstroStack

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sci-overlay/sci: Added few missing PYTHON_DEPENDS

Package-Manager: portage-2.2.8-r1
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sci-overlay/sci: DEPEND fixes about configparser

Package-Manager: portage-2.2.8-r1
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sci-overlay/sci: more DEPEND fixes about configparser

Package-Manager: portage-2.2.8-r1
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Merge pull request #218 from mickolaine/pyastrostack

sci-overlay/sci: Added an ebuild for pyAstroStack