strip unlinks the file first, breaking hard links, so we detect instances where we are about to strip a file with many linkages and prevent it.
This fixes the libexec non executable bug in the git package.
Took me a long time to figure out what was wrong! :P
Moved Forumla and Cellar/homebrew into Library.
This way the homebrew core files are more sensibly placed, Cellar is
more internally consistent and only generated. And Homebrew is ready for
use straight out of the tarball.
