Drops the x11 fallback. We were falling back to QX11Extras that were in
fact using QScreen internally.
Also remove the QDesktopWidget fallbacks for the same reason.
Drops some API for fetching the dpi and unifies it with ::realDpi(QWidget).
Based on Sebas's patch.
Reviewed by Albert.
REVIEW: 126913
Includes some fixes from Albert:
* kscreen cmake fixes
Don't make libkscreen mandatory, give the proper version we need
* Fix the @since
* Kill Resolution and use a QSizeF
I first thought QSizeF didn't make sense, but well what's a dpi if not a number of pixels in width and some others in height?
* Remove unwanted const
* Remove unneeded utils.h includes
* Fix comments on realDPIXY()
* Make it compile in non X11
REVIEW: 111829
create again the options to force the DRM (give -DOKULAR_FORCE_DRM=ON to cmake)
KPDF_FORCE_DRM -> OKULAR_FORCE_DRM
svn path=/branches/work/kde4/playground/graphics/okular/; revision=542815