* Objects now support up to 32767 material slots. It's easy to increase this further, but I prefer not to increase the memory usage of mesh faces, it seems unlikely that someone would create 32767 distinct materials? * Forward compatibility: the only thing you can potentially lose reading a 2.5 file in 2.4 is object linking (instead of default data), though usually that will go fine too. Reading files with > 32 material slots in 2.4 can start giving issues. * The ob->colbits variable is deprecated by the array ob->matbits but I didn't remove the ob->colbits updates in very few places it is set. * I hope I changed all the relevant things, various places just hardcoded the number 16 instead of using the MAXMAT define. * Join Objects operator back. This is using the version from the animsys2 branch coded by Joshua, which means it now supports joining of shape keys. * Fix for crash reading file saved during render.