Radical.pilot

- transition to Python3
- migrate Rhea to Slurm
- ensure PATH setting for sub-agents
- CUDA is now handled by LM
- fix / improve documentation
- Sched optimization: task lookup in O(1)
- Stampede2 prun config
- testing, flaking, linting and travis fixes
- add `pilot.stage_out` (symmetric to `pilot.stage_in`)
- add noop sleep executor
- improve prrte support
- avoid state publish during idle times
- cheyenne support
- default to cont scheduler
- configuration system revamp
- heartbeat based process management
- faster termination
- support for Frontera
- lockfree scheduler base class
- switch to RU ZMQ layer


--------------------------------------------------------------------------------

- port pubsub hotfix


--------------------------------------------------------------------------------

- transition to Python3


--------------------------------------------------------------------------------

- Stampede-2 support


--------------------------------------------------------------------------------

- fix sandbox setting on absolute paths


--------------------------------------------------------------------------------

- implement function executor
- implement / improve PRTE launch method
- PRTE profiling support (experimental)
- agent scheduler optimizations
- summit related configuration and fixes
- initial frontera support
- archive ORTE
- increase bootstrap timeouts
- consolidate MPI related launch methods
- unit testing and linting
- archive ORTE, issue 1915
- fix `get_mpi_info` for Open MPI
- base classes to raise notimplemented. issue 1920
- remove outdated resources
- ensure that pilot env reaches func executor
- ensureID uniqueness across processes
- fix inconsistencies in task sandbox handling
- fix gpu placement alg
- fix issue 1910
- fix torque nodefile name and path
- add metric definitions in RA support
- make DB comm bulkier
- expand resource configs with pilot description keys
- better tiger support
- add NOOP scheduler
- add debug executor


--------------------------------------------------------------------------------