The field needs to have its own copy, otherwise the pointer will
become invalid when xfree()'d by a separate array task.

Bug 3665.

So that it is the same max length as in src/common/env.c.

Used for explicitly laying out tasks on large CPU count nodes (e.g., KNL).

Bug 3675.

For use in federated environments.

in any case.

As specified in MPIR debug interface
(https://www.mpi-forum.org/docs/mpir-specification-10-11-2010.pdf),
the presence of the MPIR_partial_attach_ok symbol
should inform the debugger that the initial startup synchronization
is implemented in such a way that the tool need not attach
nor continue MPI processes that the user is not interested in controlling.

To implement this, SLURM chose to send SIGCONT to those processes that are
not attached by the debugger.

However, the old code does not reliably detect the condition
in which a process is traced by the debugger, and this
has lead to various side effects.

On some systems (e.g., TOSS2), the old code sends SIGCONT to
all of the target processes including those attached by the debugger.
On newer systems (e.g., TOSS3), it does not send SIGCONT
to the target processes at all.

It seems that one of the reasons for such undefined behavior
is the use of CLONE_PTRACE.
@grondo found no documentation that indicates
CLONE_PTRACE is for the case where the process is being attached
by a debugger.
More importantly, this code is matching clone(2) flags
to proc(5) process flags, which are not the same, as task->flags
defined as PF_* flags from kernel source include/linux/sched.h.

This patch fixes these problems by replacing
the old detection logic with ones based on the TracerPid field
in /proc/<pid>/status.

From proc(5), TracerPid: PID of process tracing this process (0 if not
being traced).

Improve job scheduling sort after sorting by priority we now sort by
submit time and then by job id.  We used to not consider submit time.  This
handles the case where the job_ids have rolled or we are doing federation
scheduling.

Bug 3524

All problems introduced in the course of changing un/pack logic
  required for removing pack jobs logic

bug 926

bug 926

bug 926

Display with -Ocluster
Sort with -S[+|-]cluster

bug 926

least an admin for clearer code.

We can used the authorized key else.

but don't give them admin privileges.

Add missing --local option
Add note about -M implying --local.

environment variable and indentation.

They could either be running on another cluster or not active on the
cluster.

Continuation of 3a9970c0

If a task in a parallel job fails and it was launched with the
    --kill-on-bad-exit option then terminated the remaining tasks using the
    SIGCONT, SIGTERM and SIGKILL signals rather than just sending SIGKILL.

Sinfo command with support for federated clusters

The job was completing before the test could find that the job was
running. The script was running for 10 seconds and wait_for_fed_job can
back off and check only every 10 seconds.

Can't use the revoked state to determine if the job is pending or not
since an origin job could be revoked if it doesn't have an active job on
itself.

Coverity CID 45347

Coverity CID 45345 and 45346

Coverity CID 45342

Coverity CID 45340

Coverity CID 45341

Avoid comparision between double and int
Coverity CID 45336