updating instances to support singularity instances subgroup >= 3.0 #76
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This will address the change for Singularity 3.0 that the instances subgroup is no longer one string, joined by period.
E.g., the old "singularity instance.list" is now "singularity instance list".
To support both versions for the user, we derive behavior of this client based on the singularity --version returned by the host. If the host wants to override this behavior, the environment variable
SPYTHON_SINGULARITY_VERSIONcan be exported, e.g.,export SPYTHON_SINGULARITY_VERSION=3.0This will close #75