Use relative includes in headers and absolute in code

- relative includes in headers
- absolute includes in exe code
- include sstream lib in eoExceptions.h
- fix ga/make_op_ga.cpp
- fix eoSGATransform.h

eo/src/mpi/eoMpiNode.cpp

@@ -19,7 +19,7 @@ Contact: http://eodev.sourceforge.net
 Authors:
     Benjamin Bouvier <benjamin.bouvier@gmail.com>
 */
-# include "eoMpiNode.h"
+#include "eoMpiNode.h"
 
 namespace eo
 {