* Make it possible to change refresh rate and rotation for enabled screens (by employing a more fine-grained change condition).
* Only attempt to change outputs/CRTCs if there is actually something that needs to be changed.
* Further improved debug output.

This essentially makes the KCM work as expected (while keeping krandrtray in a working state too), just in time for the upcoming beta.

The Clone/Position combo box and the graphics view still like to ignore newly enabled/disabled outputs, but hey, I can now configure my screen without the xrandr command line utilty! Whoo.