'git subtree split' now basically works.
tree689ee941366d67b99e405941734ea5e90cbfbd0e
-rw-r--r-- 3 .gitignore
lrwxrwxrwx 14 git-subtree -> git-subtree.sh
-rwxr-xr-x 2447 git-subtree.sh
-rw-r--r-- 23 shellopts.sh