Did the actual fix for getting the correct information on clusters of any dimension size from accounting when querying against a hostlist

Added scontrol ability to increment or decrement a job or step time limit.

Modify the man2html calling sequence for a clean build of SLURM from the
source directory. The old code would copy the header.txt and footer.txt
files from "srcdir" to "." and generate an error if they were the same
files. The new code just passes the pathnames of the files into the
man2html python script

would not be set correctly in the added child association.

Add an configure option of --enable-salloc-kill-cmd which will
cause the salloc command to signal its child processes when the
job ends. Job signalling will be the default for Cray systems.
Jobs will not be signalled by default on other systems. SIGHUP
will be used for interactive jobs and SIGTERM will be used for
other jobs.

Change the reason that a node is marked DOWN and the log message
from node "silent reboot" to "unexpected reboot"

Patch from Don Albert, Bull

With default configuration on non-Cray systems, enable salloc to be
spawned as a background process. Based upon work by Don Albert (Bull) and
Gerrit Renker (CSCS).

Add support to salloc for a new environment variable SALLOC_KILL_CMD,
which is equivalent to the -K/--kill-command option.

This fixes a bug which is thanks to a report by Don Albert.

The problem is that whenever salloc exits with a child process in stopped state
(suspended or stopped on terminal input/output), a zombie process is generated,
since this case is not caught by the code evaluating the child status.

This patch adds the missing case.  It uses SIGKILL, which is the only signal
that changes the state of a stopped process. It was decided not to try and
re-awken the process using SIGCONT, since (a) this happens during session
clean-up and (b) if the condition is due to SIGTTIN, the process immediately
becomes stopped again.
Patch from Gerrit Renker, CSCS.

Treat the specification of multiple cluster names as a fatal error.

Note that scontrol can only support a single cluster at one time.