Portability - Haiku R1/alpha1

- Added necessary include files and edits in order to build task on
  Haiku R1/alpha1.

src/Timer.cpp

@@ -52,7 +52,7 @@ Timer::~Timer ()
     << mDescription
     << " "
     << std::setprecision (6)
-    << std::fixed
+//    << std::fixed
     << ((end.tv_sec - mStart.tv_sec) + ((end.tv_usec - mStart.tv_usec )
        / 1000000.0))
     << " sec";