Consolodating description of source extraction in CHANGES.txt.

Extracted do_floodfill, playsound, draw_progressbar and RGB-to-linear functions.

src/progressbar.h

@@ -0,0 +1,42 @@
+/*
+  progressbar.h
+
+  For Tux Paint
+  Progress bar functions
+
+  Copyright (c) 2002-2006 by Bill Kendrick and others
+  bill@newbreedsoftware.com
+  http://www.newbreedsoftware.com/tuxpaint/
+
+  This program is free software; you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation; either version 2 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program; if not, write to the Free Software
+  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+  (See COPYING.txt)
+
+  June 14, 2002 - February 17, 2006
+  $Id$
+*/
+
+
+#ifndef PROGRESSBAR_H
+#define PROGRESSBAR_H
+
+#include "SDL.h"
+
+extern SDL_Surface * img_progress;
+extern int progress_bar_disabled, prog_bar_ctr;
+
+void show_progress_bar(SDL_Surface * screen);
+
+#endif
+