Sharing the same option for the accessibility render mode and for the view mode is not a good idea, really.
So, create a new ViewMode setting for the single/facing/columns view mode (leaving the RenderMode for compatibility with KPDF).
Rename [Rr]enderMode into [Vv]iewMode in the page view, following the new name of the setting.
Remove the "padding" enums from the settings, as it seems they have no real use beside giving issues.

svn path=/trunk/KDE/kdegraphics/okular/; revision=665773