Include slice.h earlier

src/OutputByOrbit.cc

@@ -10,7 +10,6 @@
 #include "config.h"
 #include "controls.h"
 #include "log.h"
-#include "slice.h"
 #include "tools.h"
 
 OutputByOrbitStream::OutputByOrbitStream(ctrl &c, config &conf_)

src/OutputByOrbit.h

@@ -7,6 +7,7 @@
 #include <string>
 
 #include "OutputFileHandler.h"
+#include "slice.h"
 #include "tbb/pipeline.h"
 
 class ctrl;