Move around some namespaces for documentation purposes.

Fix problems with building on clang 2.8.
Remove unneeded function for get_engine() and fix functor<> calls that take a Boxed_Value

include/chaiscript/dispatchkit/function_call_detail.hpp

@@ -6,7 +6,7 @@
 
 #include <boost/preprocessor.hpp>
 
-#define addparam(z,n,text)  params.push_back(boost::is_reference<Param ## n>::value?Boxed_Value(boost::ref(BOOST_PP_CAT(p, n))):Boxed_Value(BOOST_PP_CAT(p, n) ));
+#define addparam(z,n,text)  params.push_back((boost::is_reference<Param ## n>::value&&!(boost::is_same<chaiscript::Boxed_Value, typename boost::remove_const<typename boost::remove_reference<Param ## n>::type>::type>::value))?Boxed_Value(boost::ref(BOOST_PP_CAT(p, n))):Boxed_Value(BOOST_PP_CAT(p, n) ));
 #define curry(z,n,text)  BOOST_PP_CAT(_, BOOST_PP_INC(n))
 
 
@@ -25,6 +25,7 @@ namespace chaiscript
 {
   namespace detail
   {
+
     /**
      * Internal helper class for handling the return
      * value of a build_function_caller