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.

If reservation create request included a CoreCnt value and more
nodes are required than configured, the logic in select/cons_res
could go off the end of the core_cnt array. This patch adds a
check for a zero value in the core_cnt array, which terminates
the user-specified array.
Back-port from master of commit 211c224b

If reservation create request included a CoreCnt value and more
nodes are required than configured, the logic in select/cons_res
could go off the end of the core_cnt array. This patch adds a
check for a zero value in the core_cnt array, which terminates
the user-specified array.