Merge branch 'jc/diff-no-no-index'

* jc/diff-no-no-index:
  git diff --no-index: default to page like other diff frontends
  git-diff: allow  --no-index semantics a bit more
  "git diff": do not ignore index without --no-index
  diff-files: do not play --no-index games
  tests: do not use implicit "git diff --no-index"

git.c

@@ -294,7 +294,7 @@ static void handle_internal_command(int argc, const char **argv)
 		{ "count-objects", cmd_count_objects, RUN_SETUP },
 		{ "describe", cmd_describe, RUN_SETUP },
 		{ "diff", cmd_diff },
-		{ "diff-files", cmd_diff_files },
+		{ "diff-files", cmd_diff_files, RUN_SETUP },
 		{ "diff-index", cmd_diff_index, RUN_SETUP },
 		{ "diff-tree", cmd_diff_tree, RUN_SETUP },
 		{ "fast-export", cmd_fast_export, RUN_SETUP },