other minor mods

Enhancement to logic from previous patch
bug 407

/* Current code (<= 2.1) has it so we start the new
 * job with the next step id.  This could be used
 * when restarting to figure out which step the
 * previous run of this job stopped on. */

The Cray version of those libraries must be used.
bug 407

See
https://groups.google.com/forum/#!topic/slurm-devel/j4izr0L4w8w

switch/generic - propagate switch information from srun down to slurmd and
slurmstepd. Previously the information was not going past the srun
command.

Conflicts:
	src/common/plugstack.c

due to multiple free calls caused by job arrays submitted to
multiple partitions. The root cause is the job priority array
of the original job being re-used by the subsequent job array
entries. A similar problem that could be induced by the user
specifying a job accounting frequency when submitting a job
array is also fixed.
bug 401

sacctmgr.

Some uninitialized variables, possible NULL pointers, etc.
None of these have been seen in practice that we know of, but
these changes will bulletproof the code

Never observed, but "clang" tool reports these as possible failures

when requested to do so.