save the page-orderby per user

Bug 1360535: Save the last chosen order for pages in the user settings. Load
that as a default when nothing is selected by the user

Change-Id: I28a9461fb74c7ffef7753a145b1da0e9100f2e15
Signed-off-by: Tobias Zeuch <tobias.zeuch@kit.edu>
Merge "save the page-orderby per user"