Added CHANGELOG update

Included sRandomChars in functions.limesurvey
Add an index on the token field of the survey table

functions/functions.limesurvey.php

@@ -271,6 +271,28 @@ function getRandomID()
 }
 
 
+/**
+* Creates a random sequence of characters
+*
+* @param mixed $length Length of resulting string
+* @param string $pattern To define which characters should be in the resulting string
+* 
+* From Limesurvey
+*/
+function sRandomChars($length = 15,$pattern="23456789abcdefghijkmnpqrstuvwxyz")
+{
+    $patternlength = strlen($pattern)-1;
+    for($i=0;$i<$length;$i++)
+    {   
+        if(isset($key))
+            $key .= $pattern{rand(0,$patternlength)};
+        else
+            $key = $pattern{rand(0,$patternlength)};
+    }
+    return $key;
+}
+
+
 
 
 /**