Radical.saga

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- fix ppn for frontera
- documentation fixing (issue 765)

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- fix MANIFEST.in

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- ensure '-n' beingused for Stamepede2

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- python 3 and later have implicit namespaces
- add noop job adaptor for tests
- slurm data staging

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- small fixes and cleanup for slurm and docs (tutorial prep)

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- transition to Python3
- fix issue 744
- config fixes
- desable logger during gc
- fix attribute callback
- fix generated slurm script (walltime format)
- fix slurm for rhea
- rename async as it is a reserved word in p3
- testing, flaking, linting and travis fixes