Modify several NEWS items for greater clarity.

Dead code, except for four uses of safe_pack8 and one safe_pack16.
Convert those to the pack8/16 calls directly.

On some distributions (notably Ubuntu xenial), the mariadb client
dev package doesn't include a compatibility link for mysql_config.
This patch makes configure look for mariadb_config as an alternative
and allows building the mysql plugins against mariadb client libs.

This changes a <= to <, although it doesn't really change functionality
  in practice.

Add new PriorityFlags option of INCR_ONLY, which prevents a job's priority
    from being decremented.
Added for NERSC

Rework 84966568, 5510e7d3 so that it reduces the number
of else statements.

Bug 3271

Prevent a scrollbar from appearing on the SchedMD logo in the top left.

If a node is booting for some job, don't allocate additional jobs to the
    node until the boot completes.
but 3256

doing an upgrade.

It isn't advised.  Do one then the other.  Basically if you are using the
mysql plugin make sure you add the cluster to the system as the mysql
plugin doesn't do that explicitly.

Bug 3131

and you wouldn't be able to read anything after the cut.

Found with valgrind. Bug 2846.

Move where we set the configuration table bitmaps in order to support
  the backup slurmctld starting and recovering previously saved
  KNL mode information (which can necessitate rebuilding the node
  configuration table).
bug 3241

Bug 3255.

No functional change.

Bug 3237.

Page needs to display properly even if the CDN gets rid of this, or
for machines with no internet connectivity.

Fix a few minor style issues, and remove some unused javascript.

Change header and footer over to new design, switch around the css
files, and adjust the build system to match.

Design by Grant Zabriskie.

Stop bundling the file in docs (will be preserved on SchedMD site, and
is in git), and unlink from build.