Build fixing macos deploy issue feb 2020

Merged Remi Perenon requested to merge build-fixing_macos_deploy_issue_feb_2020 into develop

macOS build has been changed:

  • macOS server has been updated to macOS Catalina (10.15)
  • py2app is no more functional, so we package manually MDANSE with local "pre-bundle"
  • deploy stage has been cleaned

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