Radical.saga

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- support for Frontier
- added set of PPNs per queue
- add some job attributes to the shell adaptor but ignore them

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- added core specialization option (SLURM)
- enforce to use `threads-per-core` only if `smt` is in `system_architecture`
- fixed value for `processes_per_host`
- let shell_wrapper.py close file more promptly.
- updated and cleaned PBSPro adapter

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- bump python test env to 3.7
- enhanced SMT control (same approach as for LSF adaptor)
- SAGA.Exception to not overwrite representation
- sync with ru

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- add namespace docs as they are not pulled via inheritance
- allow to trap `SIGTERM` before `SIGKILL` is sent

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- add resource `ascent` into LSF adaptor
- add `threads-per-core` parameter (Slurm)
- convince traverse to provide GPUs
- enforce a predefined directory for the batch-script
- fix SMT setup (in sync with RADICAL-Pilot SMT setup)
- keep sbatch script within job's working directory

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- move `host_is_local` to RU
- spock needs -N