Updated modules to allow for partial overrides without errors

Only define functions if they have not been defined before, e.g. in themes. This makes it possible to override parts of a module and still use the other functions.

mod/editpost.php

@@ -2,6 +2,7 @@
 
 require_once('include/acl_selectors.php');
 
+if(! function_exists('editpost_content')) {
 function editpost_content(&$a) {
 
 	$o = '';
@@ -150,7 +151,5 @@ function editpost_content(&$a) {
 	));
 
 	return $o;
-
 }
-
-
+}