css tweaks (based on inspecting output)
Ignore wkhtmltopdf errors.

The wkhtmltopdf call is pretty flaky. If it breaks, it’s not the end of
the world.
Make it easier to test auto PDF generation

 - Never attempt to auto-generate notes or extras
 - Add an extra option to use both phantomjs and wkhtmltopdf to
   generated PDFs (for comparison)
 - Generate a PDF even if one already exists in input (again, for
   comparison)
 - Display the auto-generated PDF listings a bit more nicely
   (right-aligned, that sort of thing)