fix include style relating to cplusplus libraries

... and adjust INCLUDEPATH accordingly.

while i'm at messing with include statements, also re-order the include
blocks according to policy and sort them within bigger blocks.

Change-Id: I7762abfd7c4ecf59432b99db2f424e4fa25733a5
Reviewed-by: Tobias Hunger <tobias.hunger@digia.com>
Reviewed-by: Eike Ziller <eike.ziller@digia.com>

src/plugins/cpptools/insertionpointlocator.h

@@ -31,12 +31,11 @@
 #define INSERTIONPOINTLOCATOR_H
 
 #include "cpptools_global.h"
+#include "cpprefactoringchanges.h"
 
-#include <ASTfwd.h>
-#include <CPlusPlusForwardDeclarations.h>
-
+#include <cplusplus/ASTfwd.h>
+#include <cplusplus/CPlusPlusForwardDeclarations.h>
 #include <cplusplus/CppDocument.h>
-#include <cpptools/cpprefactoringchanges.h>
 
 namespace CppTools {