scheduling is performed.

This is a merge of all slurm modifications added to support a Sun Constellation system 
  with 4-D name space (3-D for coordinate followed by a sequence number for the node at
  that coordinate).

    running for a job allocated to that node.

    or too small, automatically try using the previously saved state (file 
    name with ".old" suffix).
This is the same logici added early for jobs.

    previously saved state.

string is null.  This fixes the srun -B option function as documented.