small improvement of GUI. Backend waits until there is valid input to start.
View settings brings window to front.

Change-Id: I46bedbb5dff581ab7a213ae993a47aca3f2e544b
diff --git a/gui/chronosharegui.h b/gui/chronosharegui.h
index bf42515..23f6e9d 100644
--- a/gui/chronosharegui.h
+++ b/gui/chronosharegui.h
@@ -89,6 +89,10 @@
   // capture close event
   void closeEvent(QCloseEvent* event);
 
+  // starts fs watcher and dispatcher
+  void
+  startBackend();
+
 private:
   QSystemTrayIcon* m_trayIcon; // tray icon
   QMenu* m_trayIconMenu; // tray icon menu