added functionality for a global qos_list so we don't have to continually query the db.  We also added start of ability to add preempt.  No checks are there yet.

added logic to make it possible for qos to be updated on the fly and added to associations when they are added to the mix

to pass the memory check cleanly.

BLUEGENE - env vars such as SLURM_NNODES, SLURM_JOB_NUM_NODES, and SLURM_JOB_CPUS_PER_NODE now reference cnode counts instead of midplane counts.  SLURM_NODELIST still references midplane names.

error instead of doing an assertion failure.