Alter way in which user chooses minted for latex source code export

* lisp/org-exp.el (org-export-format-source-code-or-example): Use
  minted for latex source code export if `org-export-latex-listings' has
  the value 'minted
* lisp/org-latex.el (org-export-latex-listings): Document special
  value 'minted
* lisp/org-latex.el (org-export-latex-minted): Delete variable

lisp/org-exp.el

@@ -607,7 +607,6 @@ table.el tables."
     (:TeX-macros	      "TeX"	  org-export-with-TeX-macros)
     (:LaTeX-fragments	      "LaTeX"	  org-export-with-LaTeX-fragments)
     (:latex-listings	      nil         org-export-latex-listings)
-    (:latex-minted	      nil         org-export-latex-minted)
     (:skip-before-1st-heading "skip"	  org-export-skip-text-before-1st-heading)
     (:fixed-width	      ":"	  org-export-with-fixed-width)
     (:timestamps	      "<"	  org-export-with-timestamps)
@@ -2235,7 +2234,6 @@ in the list) and remove property and value from the list in LISTVAR."
 (defvar org-export-latex-listings) ;; defined in org-latex.el
 (defvar org-export-latex-listings-langs) ;; defined in org-latex.el
 (defvar org-export-latex-listings-w-names) ;; defined in org-latex.el
-(defvar org-export-latex-minted) ;; defined in org-latex.el
 (defvar org-export-latex-minted-langs) ;; defined in org-latex.el
 (defvar org-export-latex-minted-with-line-numbers) ;; defined in org-latex.el
 
@@ -2368,7 +2366,8 @@ INDENT was the original indentation of the block."
 	      (concat "#+BEGIN_LaTeX\n"
 		      (org-add-props
                           (cond
-			   (org-export-latex-listings
+			   ((and org-export-latex-listings
+				 (not (eq org-export-latex-listings 'minted)))
 			    (concat
 			     (if lang
 				 (let*
@@ -2388,7 +2387,7 @@ INDENT was the original indentation of the block."
 					"_" "\\\\_" caption)))
 			     "\\begin{lstlisting}\n"
 			     rtn "\\end{lstlisting}\n"))
-			   (org-export-latex-minted
+			   ((eq org-export-latex-listings 'minted)
 			    (if lang
 				(let*
 				    ((lang-sym (intern lang))

lisp/org-latex.el

@@ -376,7 +376,25 @@ for example using customize, or with something like
 
   (require 'org-latex)
   (add-to-list 'org-export-latex-packages-alist '(\"\" \"listings\"))
-  (add-to-list 'org-export-latex-packages-alist '(\"\" \"color\"))"
+  (add-to-list 'org-export-latex-packages-alist '(\"\" \"color\"))
+
+Alternatively,
+
+  (setq org-export-latex-listings 'minted)
+
+causes source code to be exported using the minted package as
+opposed to listings. If you want to use minted, you need to add
+the minted package to `org-export-latex-packages-alist', for
+example using customize, or with
+
+  (require 'org-latex)
+  (add-to-list 'org-export-latex-packages-alist '(\"\" \"minted\"))
+
+In addition, it is neccessary to install
+pygments (http://pygments.org), and to configure
+`org-latex-to-pdf-process' so that the -shell-escape option is
+passed to pdflatex.
+"
   :group 'org-export-latex
   :type 'boolean)
 
@@ -411,23 +429,6 @@ of noweb."
   :group 'org-export-latex
   :type 'boolean)
 
-(defcustom org-export-latex-minted nil
-  "Non-nil means export source code using the minted package.
-This package will fontify source code with color.
-If you want to use this, you need to make LaTeX use the
-minted package. Add this to `org-export-latex-packages-alist',
-for example using customize, or with something like
-
-  (require 'org-latex)
-  (add-to-list 'org-export-latex-packages-alist '(\"\" \"minted\"))
-
-In addition, it is neccessary to install
-pygments (http://pygments.org), and configure
-`org-latex-to-pdf-process' so that the -shell-escape option is
-passed to pdflatex."
-  :group 'org-export-latex
-  :type 'boolean)
-
 (defcustom org-export-latex-minted-langs
   '((emacs-lisp "common-lisp")
     (cc "c++")