srun --nodes=16 --constraint=graphics*4 ...
    Based upon work by Kumar Krishna (HP, India).

    job steps to be queued when resources are not available within an existing
    job allocation to dedicate the resources to the job step. Useful for
    executing simultaneous job steps. Provides resource management both at
    the level of jobs and job steps.

    steps rather than cancelling the job. This now matches the behavior of
    all other signals. "scancel <jobid>" still cancels the job and all steps.

determine actual minimum mem size and proc count before 
trying to use them. 
reorder tests in sbatch output to match actual output order
 (regular expression tests are done strictly in order (at least 
 for some versions of expect).

checkpoint as required, still need to perform actual checkpoint 
operation