Radical.pilot

- Hotfix release for off-by-one error (621)


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

- Hotfix release for MPIRUN_RSH on Stampede (572).


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

- version bump to trigger pypi release update


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

- hotfix to handle broken pip/bash combo on archer


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

- hotfix to handle stale ve locks


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

- This release contains a very large set of commits, and covers a
fundamental overhaul of the RP agent (amongst others). It also
includes:
- support for agent profiling
- removes a number of state race conditions
- support for new backends (ORTE, CCM)
- fixes for other backends
- revamp of the integration tests


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