[cmucl-imp] New directory structure

Currently when you clone cmucl, you get a directory structure like cmucl/ BUILDING assembly/ code/ compiler/ tools/ <etc> I want to change the structure to be cmucl/ BUILDING bin/ build.sh build-all.sh create-target.sh src/ This is much convenient when using git. It might be possible to rearrange things even more, but I think this is good enough. I'm tired of having to cd to src to git diffs and logs and such. With this structure, I don't have to anymore. Ray