* README-hacking: Prefer the no-hyphen variant of git commands,
e.g., use "git pull" not "git-pull".
Don't presume that the only way to read this document is via a
prior git clone: provide instructions for cloning coreutils, too.
* README-hacking: Add "cd automake" in build instructions.
From Bob Proulx.
* README-hacking: Build-from-checkout now require Perl, too.
* bootstrap: Now that these generated Makefile.am files are no longer
under version control, they must be created at bootstrap time.
