Teach --find-copies-harder to "git blame"

It's equivalent to "-C -C" with the diff family.
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

builtin-blame.c

@@ -2346,6 +2346,10 @@ int cmd_blame(int argc, const char **argv, const char *prefix)
 parse_done:
 	argc = parse_options_end(&ctx);
 
+	if (DIFF_OPT_TST(&revs.diffopt, FIND_COPIES_HARDER))
+		opt |= (PICKAXE_BLAME_COPY | PICKAXE_BLAME_MOVE |
+			PICKAXE_BLAME_COPY_HARDER);
+
 	if (!blame_move_score)
 		blame_move_score = BLAME_DEFAULT_MOVE_SCORE;
 	if (!blame_copy_score)