Code review comment for lp:~tomasgroth/openlp/mupdf

I need some feedback/guidance/help to finish this implementation...
The basic idea is to use mupdf or ghostscript to create a picture for each page in the PDF, and when going to live/preview mode, then replace the service_item with an image-based service_item. I've made it work when going to live/preview from the mediamanager, but I can't figure out how/where to do it from the servicemanager - any hints would be appreciated! As an alternative it can be implemented as the other presentation-backends, with a "player".

I'd also like some directions as to what tests to include? I couldn't find any tests for the other presentation backends...

And finally, I've added some extra fields to the presentation-settings-tab, and for some reason now all fields has moved a bit to the right instead for being to the far left - any hints as to why?