Conflicts:
	RELEASE_NOTES

Without this, an xfree could be called for an arbitrary memory location

Rather than continuously retrying a step create for suspended jobs,
add a sleep with exponential backoff

If a job is suspended, log the step create failure using debug
rather than info in slurmctld

Conflicts:
	src/plugins/switch/nrt/nrt.c

Cache results for major performance improvement.
bug 636

The test for NRT_NULL_MAGIC failed to capture some problems
if the pointer to the structure was NULL. This is an ammendment
to commit 2a55aa0b

If a job request explicitly requests a GRES count of zero and that
is not the last GRES in the slurm internal data structures, the job
request will be rejected.
bug 633

Conflicts:
	src/plugins/switch/nrt/nrt.c

Perhaps should also look into doing this for nodeinfo and libstate

this would cause pmd's to hang.

This prevented jobs from sharing nodes

code.