Print CSS for casts

[mvdandrieux]

It's a very popular demand : some of our data will be processed by more senior profiles, used to paper text. It would be important to be able to print a cast.
A simple @mediatype "print" css would do, stripping down useless content and focusing on:

• the name of the collection
• the strip of images
• the title, tags, descr and comments of the active cast.