[darwinbuild-dev] Xcode 3.1 Support

The latest source in trunk should work with Xcode 3.1 in general. I havnt tried every project yet, but you shouldnt get any ugly assertions or crashes. If you get something to the effect of missing files in "/XCD/loper/usr/bin/", just file a ticket so I can adjust the script to include the binary thats missing. I'm trying to avoid wholesale copying of /Developer/usr/bin and trying to use as much of the open source projects in /usr/bin as possible instead. For now that means manually maintaining two lists in the installXcode31. Thanks -Bill