We used to mark hooks we ship as samples by making them unexecutable, but
some filesystems cannot tell what is executable and what is not.

This makes it much more explicit.  The hooks are suffixed with .sample
(but now are made executable), so enabling it is still one step operation
(instead of "chmod +x $hook", you would do "mv $hook.sample $hook") but
now they won't get accidentally enabled on systems without executable bit.

Signed-off-by: Junio C Hamano <gitster@pobox.com>

This uses "git-apply --whitespace=strip" to fix whitespace errors that have
crept in to our source files over time.  There are a few files that need
to have trailing whitespaces (most notably, test vectors).  The results
still passes the test, and build result in Documentation/ area is unchanged.

Signed-off-by: Junio C Hamano <gitster@pobox.com>

These two sample hooks try to detect and use the corresponding
commit hook from the same repository.  However, they forgot to
set up GIT_DIR for their own use, so was not in effect.

Signed-off-by: Junio C Hamano <junkio@cox.net>

This teachs git-applypatch, which is used from git-applymbox, three
hooks, similar to what git-commit-script uses.

Signed-off-by: Junio C Hamano <junkio@cox.net>