Fraqtive 0.4.2 released

This release adds only one, but very interesting feature: rendering the fractal surface as a 3D mesh, using the OpenGL library for hardware-accelerated performance. It's possible to adjust the mesh resolution and various parameters of the view. The rendered image can also be saved or copied to clipboard.

Please test the 3D view and report any problems or suggestions. I will make one or two more releases of Fraqtive to close the first phase of the development roadmap by the end of May.