Add .dir-locals.el

* .dir-locals.el: New file.
* README (Local variables): Move fill-column to .dir-locals.el.
* elpa-packages (Local Variables): Move indent-tabs-mode to .dir-locals.el.

.dir-locals.el

@@ -0,0 +1,17 @@
+;;; Directory Local Variables
+;;; For more information see (info "(emacs) Directory Variables")
+
+((nil . ((tab-width . 8)
+         (sentence-end-double-space . t)
+         (fill-column . 70)
+         (bug-reference-url-format . "https://debbugs.gnu.org/%s")))
+ (log-edit-mode . ((log-edit-font-lock-gnu-style . t)
+                   (log-edit-setup-add-author . t)))
+ (change-log-mode . ((add-log-time-zone-rule . t)
+                     (fill-column . 74)
+                     (mode . bug-reference)))
+ (diff-mode . ((mode . whitespace)))
+ (lisp-data-mode . ((indent-tabs-mode . nil)
+                    (electric-quote-comment . nil)
+                    (electric-quote-string . nil)
+                    (mode . bug-reference-prog))))

README

@@ -587,7 +587,6 @@ along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.
 #+BEGIN_COMMENT
 Local variables:
 mode: org
-fill-column: 70
 paragraph-separate: "[ 	]*$"
 time-stamp-pattern: "4/#\\+DATE: %Y-%02m-%02d$"
 end:

elpa-packages

@@ -580,7 +580,3 @@
  ("zones"		:url nil)  ;https://www.emacswiki.org/emacs/zones.el
  ("ztree"		:url "https://github.com/fourier/ztree")
  )
-
-;; Local Variables:
-;; indent-tabs-mode: nil
-;; End: