Expand CTE testing and begin to make this more prominent.

Expand CTE testing and begin to make this more prominent.

SQLite supports CTEs as do both the MariaDB and MySQL
databases now.  Expand test support and begin adding
new tutorial sections to make this concept more prominent.

Also fix some formatting issues in the tutorial, and start
moving more towards {opensql} - the "SQL" button thing
is cool but the tutorials mainly need to illustrate how
the SQL looks for things.  Screens are bigger now and
we likely should move away from the SQL button almost
entirely.

CTE for the tutorial needed zzzeeksphinx fix to recognize
"WITH" so bumping that to latest release number in git.

Change-Id: Ia1bbe3248b4f7c74fbee06fedf76a6ce94cd28a6
References: #5269