Set up Cover page capability

[Paul Whipp]

Every book must have a 'cover page'. This can be any supplied but will also be picked up automatically from the scan pages if available and not supplied

[Paul Whipp]

I've used a standard thumbnail size of 150x225 (later we'll add proper thumbnails)

Finding an appropriate page of the book for the cover is tricky. For now I've added a <book_identity>_thumbnail.jpg file to each book so we can move forwards.

[oldrepository]

is there a possibility to add a book cover to the same page as the Add Book page, so that a book cover can be added manually from there as well. In order for it to do it automatically, theres a option in the scan data.xml file to mark pages as a cover page. If it can pickup data for there that would be great but I guess that would involve more work so we can look into that later on.