Make UI for scanning from ADF more easy to use

[Jonny007-MKD]

Typically I scan ~10 documents with varying number of pages via ADF.
The UI could be improved so that I can enter the number of pages more simply: the field for the page count could already selected when the window is opened. When I press Enter in this field (or perhaps Shift+Enter or something) a new entry is added and the field for the number of pages is already selected so that I can continue adding documents without using the mouse. For example, I could then open the ADF window and start typing:
3 {Enter} 2 {Enter} 4 {Enter} 1 {Enter}
and have defined 4 documents.

[jflesch]

Actually, I intend to simplify it quite a lot. I'm going to remove the whole dialog, and just scan immediately all the pages it can scan from the feeder, and add them to the current document (or to "New document" if that's what's currently opened)