Rip out merge-order and make "git log <paths>..." work again.

Well, assuming breaking --merge-order is fine, here's a patch (on top of
the other ones) that makes

	git log <filename>

actually work, as far as I can tell.

I didn't add the logic for --before/--after flags, but that should be
pretty trivial, and is independent of this anyway.

Signed-off-by: Junio C Hamano <junkio@cox.net>
diff --git a/git-archimport.perl b/git-archimport.perl
index 6792624..740bc1f 100755
--- a/git-archimport.perl
+++ b/git-archimport.perl
@@ -928,7 +928,7 @@
 
 	# now walk up to the mergepoint collecting what patches we have
 	my $branchtip = git_rev_parse($ps->{branch});
-	my @ancestors = `git-rev-list --merge-order $branchtip ^$mergebase`;
+	my @ancestors = `git-rev-list --topo-order $branchtip ^$mergebase`;
 	my %have; # collected merges this branch has
 	foreach my $merge (@{$ps->{merges}}) {
 	    $have{$merge} = 1;
@@ -951,7 +951,7 @@
 	# see what the remote branch has - these are the merges we 
 	# will want to have in a consecutive series from the mergebase
 	my $otherbranchtip = git_rev_parse($branch);
-	my @needraw = `git-rev-list --merge-order $otherbranchtip ^$mergebase`;
+	my @needraw = `git-rev-list --topo-order $otherbranchtip ^$mergebase`;
 	my @need;
 	foreach my $needps (@needraw) { 	# get the psets
 	    $needps = commitid2pset($needps);