[ZM] Merge: New screen design for newspapaer calendar editor

In consultation with Knut Lohse from Staatsbibliothek zu Berlin the screen desing of the calendar editor has been revised. This is the new screen design:

![mro_0001](https://cloud.githubusercontent.com/assets/3040657/4902037/6bd8c94e-6436-11e4-9135-465ca2896cd1.png)

On the granularity screen, the number of pages showing was changed from total to pages per issue. A lock can be configured so that the functions on that page cannot be used unless a defined number of pages per process has been entered.

All pages have been equiped with buttons to navigate “back” and “next”.