Add Fl::set_mouse method.

FL/Fl.H

@@ -531,13 +531,16 @@ public:
     open it.
   */
   static void get_mouse(int &,int &); // platform dependent
+  /**
+    Set the pointer position in screen relative coordinates
+  */
+  static void set_mouse(int x,int y); // platform dependent
   /**
     Returns non zero if we had a double click event.
     \retval Non-zero if the most recent FL_PUSH or FL_KEYBOARD was a "double click".  
     \retval  N-1 for  N clicks. 
     A double click is counted if the same button is pressed
-    again while event_is_click() is true.
-    
+    again while event_is_click() is true.    
    */
   static int event_clicks()	{return e_clicks;}
   /**

src/Fl_x.cxx

@@ -765,6 +765,13 @@ void Fl::get_mouse(int &xx, int &yy) {
   yy = my;
 }
 
+void Fl::set_mouse(int x, int y) {
+  fl_open_display();
+  Window root = RootWindow(fl_display, fl_screen);
+  XWarpPointer(fl_display,None,root,0,0,0,0,x,y);
+}
+
+
 ////////////////////////////////////////////////////////////////
 // Code used for paste and DnD into the program: