PTB BETA RELEASE "Hammertime!" SP2 "Flowerpower"

* Cool new SuperShapeDemo by Joana Leitao.
* Display rotation support in PanelFitter, as shown by PanelFitterDemo.
* Make 'DrawText' on Linux multi-x-screen capable and even faster than before.
* Make BitsPlusImagingPipelineTest a little bit more lenient.
* Improve display locking on Linux, and various micro-optimizations.
* Remove beamposition timestamping support for Intel gpu's on OSX and Linux.
* Small improvements to Daq toolbox and other stuff.
* Disable mex files for OSX versions before 10.6 Snow Leopard.