git-pickaxe: blame rewritten.

Currently it does what git-blame does, but only faster.

More importantly, its internal structure is designed to support
content movement (aka cut-and-paste) more easily by allowing
more than one paths to be taken from the same commit.

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

t/annotate-tests.sh

@@ -4,6 +4,7 @@
 check_count () {
 	head=
 	case "$1" in -h) head="$2"; shift; shift ;; esac
+	echo "$PROG file $head" >&4
 	$PROG file $head >.result || return 1
 	cat .result | perl -e '
 		my %expect = (@ARGV);