Delete emptied front-end files, and move rest to gtk directory

Remove #ifdeffed-out Xt code that has GTK implementation. The xgamelist
and xhistory have been completely cleared off content, and were removed.

Makefile.am

@@ -10,10 +10,9 @@ endif
 
 ### define sources for the front-end and backend
 
-GTKsources = xboard.c  xtimer.c xgamelist.c \
-             xhistory.c  xoptions.c  xboard.h  \
-             xengineoutput.c  xgamelist.h \
-             xhistory.h
+GTKsources = gtk/xboard.c  gtk/xboard.h \
+             gtk/xoptions.c  gtk/xtimer.c \
+             gtk/xengineoutput.c
 
 Xsources   = xaw/xboard.c xaw/xboard.h \
              xaw/xengineoutput.c \
@@ -49,6 +48,7 @@ backendsources = backend.c backend.h backendz.h \
 
 if withGTK
   xboard_SOURCES = $(backendsources) $(GTKsources)
+  headers = -I gtk
 endif
 if withXaw
   xboard_SOURCES = $(backendsources) $(Xsources)

dialogs.h

@@ -152,6 +152,7 @@ void SetDialogTitle  P((DialogClass dlg, char *title));
 void LoadListBox P((Option *opt, char *emptyText, int n1, int n2));
 void HighlightListBoxItem P((Option *opt, int nr));
 void HighlightWithScroll P((Option *opt, int sel, int max));
+void ScrollToCursor P((Option *opt, int pos));
 int  SelectedListBoxItem P((Option *opt));
 void BoardFocus P((void));
 void FocusOnWidget P((Option *opt, DialogClass dlg));
@@ -191,4 +192,3 @@ void SendString P((char *p));
 int GameListClicks P((int direction));
 void SetFilter P((void));
 
-

frontend.h

@@ -237,5 +237,6 @@ void SlavePopUp P((void));
 /* these are in xhistory.c  */
 Boolean MoveHistoryIsUp P((void));
 void HistoryPopUp P((void));
+void FindMoveByCharIndex P(( int char_index ));
 
 #endif /* XB_FRONTEND */