Fix up User Guide index page/Table Of Contents

Added a title so that the index page doesn't render with a title of "<no
title>"

Limited the TOC to 2 sections deep to keep it from getting too big.

Removed explicit naming of the sections from the index page. Sphinx
picks up the section titles automatically from the headings on the
content pages themselves. Allowing it to do so will help keep the TOC
up-to-date in the event of any section name changes.

Removed the cover image as this wasn't being displayed on this page
anyway (it is on the Introduction page).
Not Orphans

Don't need the :orphan: metadata field as these pages are all included
in the toctree.
User Guide error, warning, and typo fixes
Set timestamp_precison to 3 by default.

Ticket: #6930

See the ticket for jhb@freebsd.org excellent reasoning for this change.
Add sas2ircu to the image.

Evidentally there are LSI users with HBAs in IR mode
for which this tool would be useful.

Please do not mistake my willingness to spend seven minutes
adding this to image for affirmation that using IR volumes
with ZFS is a good idea.

Ticket: #6945
Fix the homedirectory change for AD and NT4
Python is so self-ish

Ticket: #6981
Add plural version of "VMWare-Snapshot" for better translation.
Add some more plural forms.
Handle 'auto' equally to 'Auto' in iscsi_discoveryauthmethod..

In some cases (at least after wizard) iscsi_discoveryauthmethod is
set to 'auto', that caused broken config generation.
Enable some translations.
Fix creating zvol on top of a dataset

Ticket:	#6964
Generate a suitable serial for the iSCSI target from Wizard

Ticket:	#6990
Make sure alerts are not empty/None

Reported by:	mav
Correctly install grub on replace as well

Ticket:	#6993
Fix VMWare snapshots
Fix name for failed VM snapshot

Ticket:	#6874
Workaround a bug by not allowing volume names that would trip the bug.

This will need to get fixed after the release.

Ticket: #6973
Better error message.
Set secure cookies when in "HTTPS" mode only (not in "http" or "http+https")

Ticket: #6916

Teach certificates how to serial!

Ticket: #6928