Fixed #20048, #20060 -- Modified tests for contrib apps sensitive to custom User models.

Thanks to matiasb for the report of #20060 and the draft patch for #20048.
Fix minor typo in tutorial
Moved the code to handle goto requests in a extra WizardView method.
Added some class attributes to pass initial form lists to the WizardView without the need to add them in the as_view call.
Merge pull request #943 from stephrdev/trac-19433

Fixed #19433 -- Added some class attributes to pass initial form lists to the WizardView.
Updated docs, changed versionchanged to versionadded.
Merge pull request #942 from stephrdev/trac-18000

Fixed #18000 -- Moved the code to handle goto requests to an extra WizardView method.
Fixed #9055 -- Standardized behaviour of parameter escaping in db cursors

Previously, depending on the database backend or the cursor type,
you'd need to double the percent signs in the query before passing
it to cursor.execute. Now cursor.execute consistently need percent
doubling whenever params argument is not None (placeholder substitution
will happen).
Thanks Thomas Güttler for the report and Walter Doekes for his work
on the patch.
Fixed #20119 -- Fixed typo in auth docs

Thanks vinyll for the report.
Merge pull request #941 from xakon/master

Small typo error in tutorial