Luke's fix to bug 452.
More bug fixes to CSGModeller from Marco Brenco
Marco Brenco's fixes to CSGModeller and TriMeshSimplifier
Fixed an exception when the material around the camera is not constant
Replaced MemoryImageSources in renderers with BufferedImages
Updated version number to 3.0.
Updated Portuguese translation
Object references are preserved when copying and pasting between scenes
Fixes to German translation
Global illumination did not show bump maps properly (see bug 461)