Radical.saga

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- support for anaconda client install

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- scattered bug fixes

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Note that RADICAL_SAGA_VERBOSE should now be used instead of SAGA_VERBOSE (but
the latter will be supported for a while). PTY layer debug levels can
separately be enabled via RADICAL_SAGA_PTY_VERBOSE.

- fix cray qsub arguments
- fix interpretation of relative / absolute URLs in some cases
- fix 449 - thanks jcohen02!
- keep up with logger changes in util
- properly detect failed jobs.
- follow changes on resource configurations (BW)
- remove dead code.
- fix state mapping in some queue adaptors
- clean torque/pbs separation

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- Add contexts to session at start of context list
- add tc.get_task(id)
- Add PROCESSES_PER_HOST to all job adaptors.
- sync an sdist naming fix
- Add dedicated PBS Pro adaptor.
- Get ppn from proccess_per_host.
- implement candidate_hosts for slurm adaptor
- processes_per_host for SLURM.

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- apply setup/git fix
- fix exception type exception
- convert to locking "with"/by context manager.
- only create parents for the dir part of a target.
- reentrant lock to guard concurrent cache writing.
- fix object._id format

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- set 'ssh_share_mode=no' on CentOS
- resilience against missing git in setup.py
- Prompt pattern for RSA SecureID (BW, Titan, etc.)
- cleaner version string
- treat empty strings as unset values in PBS job description
- fix slurm script generation
- implement discussed changes to job stdio inspection
- finish implementation of 202
- pre- and post-exec for shell job adaptor
- implement pre/post_exec, support in slurm, cleanup slurm submission
- clean up stdin/stdout/stderr/log handling for jobs
- sync setup.py with recent changes in RP
- Fix rounding up cores for blacklight
- ignore SIGHUP in the shell monitor -- fixes 415
- install sdist, export sdist location