Make the verbosity of the observers manager switchable from the cmake file.

CMakeLists.txt

@@ -11,7 +11,10 @@ PKG_SEARCH_MODULE(SDL2 REQUIRED sdl2)
 find_package(PNG REQUIRED)
 find_package(Boost 1.35.0 REQUIRED)
 
-add_definitions(${PNG_DEFINITIONS})
+add_definitions(
+	${PNG_DEFINITIONS}
+	-DWITH_VERBOSE_OBS_MANAGER
+)
 
 include_directories(SYSTEM
 	${SDL2_INCLUDE_DIR}

src/observersmanager.hpp

@@ -28,7 +28,7 @@
 #include <tree.hh>
 #include <boost/iterator/transform_iterator.hpp>
 
-#if defined(__GNUC__) && __GNUC__ >= 2 && !defined(NDEBUG)
+#if defined (WITH_VERBOSE_OBS_MANAGER) && defined(__GNUC__) && __GNUC__ >= 2 && !defined(NDEBUG)
 #	define OBS_MANAGER_LOG
 #endif