Major rework of headers inclusion style on behalf of lebedev.ri (issue 1079)

rtgui/guiutils.cc

@@ -15,10 +15,10 @@
  *  You should have received a copy of the GNU General Public License
  *  along with RawTherapee.  If not, see <http://www.gnu.org/licenses/>.
  */
-#include <guiutils.h>
-#include <options.h>
-#include <utils.h>
-#include <rtimage.h>
+#include "guiutils.h"
+#include "options.h"
+#include "../rtengine/utils.h"
+#include "rtimage.h"
 
 bool removeIfThere (Gtk::Container* cont, Gtk::Widget* w, bool increference) {