Install descartes in base environment

[delgadom]

Workflow

• [ ] Closes issue #
• [ ] Notebook:worker pairing builds & passes local build, visual inspection & client.map tests
• [ ] Passes travis tests
• [ ] Image deployed on dev branch (see notebook and worker dev tags)
• [ ] Worker passes manual deployment test on compute.rhg
• [ ] Notebook+worker passes test-hub deployment
• [ ] Updates integrated into downstream images

Summary

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Features

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• enumerated in bullets