Agenda: Allow to start with log mode active

Benjamin Andresen writes:

> I was curious as to why a value such log-mode wasn't customizable
> to be run on start-up as follow-mode and clock-report-mode are.
>
> If Carsten thinks this is a good idea, I've attached a patch that
> may shave of 5 seconds of him adding it. It applies cleanly to
> current git HEAD.

This commit applies Beanjamin's patch

lisp/ChangeLog

@@ -1,3 +1,8 @@
+2009-05-14  Carsten Dominik  <carsten.dominik@gmail.com>
+
+	* org-agenda.el (org-agenda-start-with-log-mode): New option.
+	(org-agenda-mode): Use `org-agenda-start-with-log-mode'.
+
 2009-05-13  Carsten Dominik  <carsten.dominik@gmail.com>
 
 	* org-latex.el (org-export-latex-tables-centered): New option.

lisp/org-agenda.el

@@ -789,6 +789,12 @@ agenda display."
   :group 'org-agenda-daily/weekly
   :type 'boolean)
 
+(defcustom org-agenda-start-with-log-mode nil
+  "The initial value of log-mode in a newly created agenda window."
+  :group 'org-agenda-startup
+  :group 'org-agenda-daily/weekly
+  :type 'boolean)
+
 (defcustom org-agenda-start-with-clockreport-mode nil
   "The initial value of clockreport-mode in a newly created agenda window."
   :group 'org-agenda-startup
@@ -1252,7 +1258,8 @@ The following commands are available:
   (unless org-agenda-keep-modes
     (setq org-agenda-follow-mode org-agenda-start-with-follow-mode
 	  org-agenda-clockreport-mode org-agenda-start-with-clockreport-mode
-	  org-agenda-show-log nil))
+	  org-agenda-show-log org-agenda-start-with-log-mode))
+
   (easy-menu-change
    '("Agenda") "Agenda Files"
    (append