[Zurich] Add full size image link to report admin

This will allow the image to be opened full size in a fancybox, just
like the front end of the site currently does.
[Zurich] Add fancybox js/css to report_edit page
Merge branch 'zurich-admin-image-zoom'
[Zurich] Show thumbnails on admin summary pages

Closes mysociety/FixMyStreet-Commercial#406
Make 'Permalink' JS string translatable.
Version 1.2.3.
[Zurich] Only super user can edit bodies
[Zurich] Only link to edit body for super user
[Zurich] Add test for superuser body editing
[Zurich] Test for only superusers can add bodies
[Zurich] Only superusers can see add body form
[Zurich] Use get_ok for superuser adding bodies test
Fix comment in tests
[Zurich] Ensure only superusers can add/edit bodies
Stop Template Toolkit indenting multiline strings.

Embed a local copy of Template::Document, which includes the change
of https://github.com/abw/Template2/pull/29 so that multiline
quoted strings within a template are not indented and thus stop
translating.
Refer to stashed variables more idiomatically
Be consistent with references in templates
Use format_datetime for DBIx::Class searches to get rid of warnings when running test suite
Remove unneeded test diagnostics
Disable info level logging in some tests