This changes the layout when the properties window gets too narrow to render the contents properly.
Currently implemented for render, scene, world, object and materials, but the rest can be done easily.
Here's a video for demonstration:
http://www.reynish.com/files/blender25/properties_resize.mov
It automatically detects the window width and then skips the indicators that tells the layout to go to the next column. It requires very minimal changes to the UI scripts so we don't have to maintain two versions of the layouts.
Contributors list isnt used much in our C code so probably its easier if people just use svn blame for this.
Can change if this isnt acceptable but I guessed people didnt care so much since most scripts had no header.
