oxy_unescapeURLValue(string) Function
      
      This function returns the unescaped value of a URL-like string given as a
         parameter.
      
      For example, if the value contains %20 it will be converted to a simple space
            character.
         
oxy_unescapeURLValue("http://www.example.com/a%20simple%20example.html")
            returns the http://www.example.com/a simple example.html value.
         