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/eoPop.h

@@ -41,10 +41,10 @@ Authors:
 #include <assert.h>
 
 // EO includes
-#include <eoOp.h> // for eoInit
-#include <eoPersistent.h>
-#include <eoInit.h>
-#include <utils/rnd_generators.h>  // for shuffle method
+#include "eoOp.h" // for eoInit
+#include "eoPersistent.h"
+#include "eoInit.h"
+#include "utils/rnd_generators.h"  // for shuffle method
 
 /** A std::vector of EO object, to be used in all algorithms
  *      (selectors, operators, replacements, ...).