Config - defaults

- Implemented replacement Config::get* methods.
- Replaced all calls throughout the code, with the new methods which
  have no static values as defaults.

src/util.cpp

@@ -589,7 +589,7 @@ std::string renderAttribute (const std::string& name, const std::string& value)
   if (a.type (name) == "date")
   {
     Date d ((time_t)::atoi (value.c_str ()));
-    return d.toString (context.config.get ("dateformat", "m/d/Y"));
+    return d.toString (context.config.get ("dateformat"));
   }
 
   return value;