Add support for auto-generating info/dir

* admin/update_autogen: Add option to generate info/dir.
(Usage): Add -I.
(info_flag): New variable.
(-I): New option.
(doc): Maybe check its status.
(info_dir): New function.

* admin/dir_top: New file.

* doc/emacs/emacs.texi:
* doc/lispintro/emacs-lisp-intro.texi:
* doc/lispref/elisp.texi:
* doc/misc/autotype.texi, doc/misc/cc-mode.texi, doc/misc/ediff.texi:
* doc/misc/ert.texi, doc/misc/htmlfontify.texi, doc/misc/ido.texi:
* doc/misc/octave-mode.texi, doc/misc/org.texi, doc/misc/srecode.texi:
* doc/misc/todo-mode.texi, doc/misc/tramp.texi:
Sync direntry with info/dir version.

1 files changed, 20 insertions, 0 deletions

diff --git a/admin/dir_top b/admin/dir_top
new file mode 100644
index 00000000000..321a39dc35e
--- /dev/null
+++ b/admin/dir_top
@@ -0,0 +1,20 @@
+This is the file .../info/dir, which contains the
+topmost node of the Info hierarchy, called (dir)Top.
+The first time you invoke Info you start off looking at this node.
+
+File: dir,      Node: Top       This is the top of the INFO tree
+
+The Info Directory
+******************
+
+  The Info Directory is the top-level menu of major Info topics.
+  Type "d" in Info to return to the Info Directory.  Type "q" to exit Info.
+  Type "?" for a list of Info commands, or "h" to visit an Info tutorial.
+  Type "m" to choose a menu item--for instance,
+    "mEmacs<Return>" visits the Emacs manual.
+  In Emacs Info, you can click mouse button 2 on a menu item
+  or cross reference to follow it to its target.
+  Each menu line that starts with a * is a topic you can select with "m".
+  Every third topic has a red * to help pick the right number to type.
+
+* Menu: