bug#21725: 25.0; list-processes dont show process id

[Tino Calancha <f92capac@gmail.com>]

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In GNU Emacs 25.0.50 (x86_64-unknown-linux-gnu, GTK+ Version 2.24.23)
  of 2015-10-21

list-processes should show the process id. This is particularly important
for those processes not associated to a buffer: showing a column with
the PID greatly simplify killing those processes when they are not needed.

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diff --git a/lisp/simple.el b/lisp/simple.el
index 8acb683..0ec03f9 100644
--- a/lisp/simple.el
+++ b/lisp/simple.el
@@ -3538,6 +3538,7 @@ process-menu-mode-map
 (define-derived-mode process-menu-mode tabulated-list-mode "Process Menu"
   "Major mode for listing the processes called by Emacs."
   (setq tabulated-list-format [("Process" 15 t)
+			       ("PID"      7 t)
 			       ("Status"   7 t)
 			       ("Buffer"  15 t)
 			       ("TTY"     12 t)
@@ -3564,6 +3565,7 @@ list-processes--refresh
 	       (process-query-on-exit-flag p))
 	   (let* ((buf (process-buffer p))
 		  (type (process-type p))
+		  (pid  (if (process-id p) (format "%d" (process-id p)) "--"))
 		  (name (process-name p))
 		  (status (symbol-name (process-status p)))
 		  (buf-label (if (buffer-live-p buf)
@@ -3599,7 +3601,7 @@ list-processes--refresh
 					 (format " at %s b/s" speed)
 				       "")))))
 		     (mapconcat 'identity (process-command p) " "))))
-	     (push (list p (vector name status buf-label tty cmd))
+	     (push (list p (vector name pid status buf-label tty cmd))
 		   tabulated-list-entries))))))
 
 (defun process-menu-visit-buffer (button)