Code

Added a --onto option, but it's so complicated I can't tell if it works.
-rw-r--r-- 3 .gitignore
lrwxrwxrwx 14 git-subtree -> git-subtree.sh
-rwxr-xr-x 4710 git-subtree.sh
-rw-r--r-- 23 shellopts.sh