Fix some more aliases to user options

* lisp/cus-edit.el (custom-mode-hook):
* lisp/erc/erc.el (erc-default-coding-system):
* lisp/progmodes/python.el (python-indent, python-guess-indent)
(python-shell-virtualenv-path)
(python-shell-completion-module-string-code)
(python-shell-completion-pdb-string-code, python-use-skeletons):
Define aliases to user options before the options are defined.

lisp/cus-edit.el

@@ -4776,6 +4776,8 @@ If several parents are listed, go to the first of them."
 	       (parent (downcase (widget-get  button :tag))))
 	  (customize-group parent)))))
 
+(define-obsolete-variable-alias 'custom-mode-hook 'Custom-mode-hook "23.1")
+
 (defcustom Custom-mode-hook nil
   "Hook called when entering Custom mode."
   :type 'hook
@@ -4804,7 +4806,6 @@ If several parents are listed, go to the first of them."
     (setq-local widget-link-suffix ""))
   (setq show-trailing-whitespace nil))
 
-(define-obsolete-variable-alias 'custom-mode-hook 'Custom-mode-hook "23.1")
 (define-derived-mode Custom-mode nil "Custom"
   "Major mode for editing customization buffers.
 

lisp/erc/erc.el

@@ -122,8 +122,6 @@
   "Running scripts at startup and with /LOAD"
   :group 'erc)
 
-(require 'erc-backend)
-
 ;; compatibility with older ERC releases
 
 (define-obsolete-variable-alias 'erc-announced-server-name
@@ -135,6 +133,8 @@
 (define-obsolete-function-alias 'erc-send-command
   'erc-server-send "ERC 5.1")
 
+(require 'erc-backend)
+
 ;; tunable connection and authentication parameters
 
 (defcustom erc-server nil

lisp/progmodes/python.el

@@ -725,12 +725,18 @@ It makes underscores and dots word constituent chars.")
 
 ;;; Indentation
 
+(define-obsolete-variable-alias
+  'python-indent 'python-indent-offset "24.3")
+
 (defcustom python-indent-offset 4
   "Default indentation offset for Python."
   :group 'python
   :type 'integer
   :safe 'integerp)
 
+(define-obsolete-variable-alias
+  'python-guess-indent 'python-indent-guess-indent-offset "24.3")
+
 (defcustom python-indent-guess-indent-offset t
   "Non-nil tells Python mode to guess `python-indent-offset' value."
   :type 'boolean
@@ -750,12 +756,6 @@ It makes underscores and dots word constituent chars.")
   :type '(repeat symbol)
   :group 'python)
 
-(define-obsolete-variable-alias
-  'python-indent 'python-indent-offset "24.3")
-
-(define-obsolete-variable-alias
-  'python-guess-indent 'python-indent-guess-indent-offset "24.3")
-
 (defvar python-indent-current-level 0
   "Deprecated var available for compatibility.")
 
@@ -2042,6 +2042,9 @@ executed through tramp connections."
   :type '(repeat string)
   :group 'python)
 
+(define-obsolete-variable-alias
+  'python-shell-virtualenv-path 'python-shell-virtualenv-root "25.1")
+
 (defcustom python-shell-virtualenv-root nil
   "Path to virtualenv root.
 This variable, when set to a string, makes the environment to be
@@ -2050,9 +2053,6 @@ virtualenv."
   :type '(choice (const nil) string)
   :group 'python)
 
-(define-obsolete-variable-alias
-  'python-shell-virtualenv-path 'python-shell-virtualenv-root "25.1")
-
 (defcustom python-shell-setup-codes nil
   "List of code run by `python-shell-send-setup-codes'."
   :type '(repeat symbol)
@@ -3289,14 +3289,6 @@ def __PYTHON_EL_get_completions(text):
   :type 'string
   :group 'python)
 
-(defcustom python-shell-completion-string-code
-  "';'.join(__PYTHON_EL_get_completions('''%s'''))"
-  "Python code used to get a string of completions separated by semicolons.
-The string passed to the function is the current python name or
-the full statement in the case of imports."
-  :type 'string
-  :group 'python)
-
 (define-obsolete-variable-alias
   'python-shell-completion-module-string-code
   'python-shell-completion-string-code
@@ -3309,6 +3301,14 @@ the full statement in the case of imports."
   "25.1"
   "Completion string code must work for (i)pdb.")
 
+(defcustom python-shell-completion-string-code
+  "';'.join(__PYTHON_EL_get_completions('''%s'''))"
+  "Python code used to get a string of completions separated by semicolons.
+The string passed to the function is the current python name or
+the full statement in the case of imports."
+  :type 'string
+  :group 'python)
+
 (defcustom python-shell-completion-native-disabled-interpreters
   ;; PyPy's readline cannot handle some escape sequences yet.  Native
   ;; completion was found to be non-functional for IPython (see
@@ -4040,6 +4040,9 @@ JUSTIFY should be used (if applicable) as in `fill-paragraph'."
 
 ;;; Skeletons
 
+(define-obsolete-variable-alias
+  'python-use-skeletons 'python-skeleton-autoinsert "24.3")
+
 (defcustom python-skeleton-autoinsert nil
   "Non-nil means template skeletons will be automagically inserted.
 This happens when pressing \"if<SPACE>\", for example, to prompt for
@@ -4048,9 +4051,6 @@ the if condition."
   :group 'python
   :safe 'booleanp)
 
-(define-obsolete-variable-alias
-  'python-use-skeletons 'python-skeleton-autoinsert "24.3")
-
 (defvar python-skeleton-available '()
   "Internal list of available skeletons.")