rev-list: make "show_bisect_vars" non static

and declare it in "bisect.h" as we will use this function later.

While at it, rename its last argument "show_all" instead of
"bisect_find_all".

Signed-off-by: Christian Couder <chriscool@tuxfamily.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/builtin-rev-list.c b/builtin-rev-list.c
index 74d22b4..c700c34 100644
--- a/builtin-rev-list.c
+++ b/builtin-rev-list.c
@@ -226,7 +226,7 @@
 	return (e < 3 * x) ? n : n - 1;
 }
 
-static int show_bisect_vars(int reaches, int all, int bisect_find_all)
+int show_bisect_vars(int reaches, int all, int show_all)
 {
 	int cnt;
 	char hex[41];
@@ -246,9 +246,10 @@
 	cnt = all - reaches;
 	if (cnt < reaches)
 		cnt = reaches;
+
 	strcpy(hex, sha1_to_hex(revs.commits->item->object.sha1));
 
-	if (bisect_find_all) {
+	if (show_all) {
 		traverse_commit_list(&revs, show_commit, show_object);
 		printf("------\n");
 	}