in the hicolor namespace. Before, the non-specified
"graphics-viewer-document" icon was used, which caused
icon loaders from other toolkits not to find this icon
as they don't consider Oxygen by default.
Also update all the references that made use of the
"graphics-viewer-document" icon in the code and
the many .desktop files.
svn path=/trunk/KDE/kdegraphics/okular/; revision=819965