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This is a bugfix release. It makes the recently added GLSL vertex shader call also work with OpenGL versions 2.0 and 2.1.
Before, an internal fragment shader had an OpenGL 3.0 requirement, and so rendering failed with older OpenGL versions.
Also, a change has been reverted that solved some z-artifacts with Nouveau on Linux, but that triggered a different kind of rendering error on MacOS X.
Finally, an error in the CMake configuration has been resolved.