Improve print to file options in print dialog

Improve print to file options in print dialog

* This patch gets rid of the separated
   fields for selecting a print to file
   target by removing the folder selection
   button and the entry. It is replaced by
   a browse button,  which opens a file
   selection dialog, that can select both
   the path AND the filename.
 * If the filename is relativ to the home
   folder it will substitute ~/ instead of
   the home folder. Additionally if the
   resulting filename is longer than 30
   characters, it cut of the first part
   and replace it by '...' so that
   the button text never gets too long.

https://bugzilla.gnome.org/show_bug.cgi?id=682129