added checks for fltk & freetype in configure script * * * added fltk_backend * * * the fltk_backend now works but that's about it * * * fltk_backend now working * * * updated ChangeLogs with all changes * * * reverted backend::close_figure to using __plot_stream__ moved OpenGL includes into gl-render.h removed check for FL/glu.h * * * configure.in: fix unquoted variable warn_graphics. * * * fixed fltk test in configure.in and also some minor style problems

--- a/src/graphics/opengl/gl-render.cc
+++ b/src/graphics/opengl/gl-render.cc
@@ -27,9 +27,6 @@
 #include <lo-mappers.h>
 #include "gl-render.h"
 
-#include <GL/gl.h>
-#include <GL/glu.h>
-
 #define LIGHT_MODE GL_FRONT_AND_BACK
 
 // Win32 API requires the CALLBACK attributes for