Fixes bug 185532 (about RTL text), helps some more complex documents where characters often ended up overstriking characters from the next text run.

Add preliminary support for BiDi text.

OK'd by Pino at http://reviewboard.kde.org/r/715/

Blog request for additional testing produced no results, which I guess indicates a lack of interest.

svn path=/trunk/KDE/kdegraphics/okular/; revision=972031