add --help and usage() info for environment options

NERSC / shifter

Shifter - Linux Containers for HPC

Other

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add --help and usage() info for environment options #216

Closed dmjacobsen closed 6 years ago

coveralls commented 6 years ago

Coverage decreased (-0.02%) to 63.846% when pulling 3add77a6d2f286b38e23a95e220b8b7f89a1989e on features/env-update-help into 7f1f9d324fb45d2fcad99e109ec4a127d7d322f1 on master.