Update singularity support #1430
Merged
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Minor cleanup - Singularity now has an internal check for installed, so we no longer need to do so.
Update the singularity support to match that of the latest singularity master. Remove the restriction on shared memory components by instructing singularity to not isolate the PID space. Add a new schizo API to allow setting up the original app_context. Ensure the container is installed prior to execution.