- another huge commit! read this!

- removed src/buttons.c and include/BIF_buttons.h
- added src/buttons.txt, which is the old buttons.c for review and adding
  code to new panels structure

- changed internal events to match new buttonspace structure
- added tabs for new shading group of buttons
- removed loads of little warnings, -Wall now compiles src/ almost without
  error (hint: setenv NAN_QUIET to see it all better)

Now I'm ready to do actual buttons -> panels conversion. I will do the raw
versions first, others then can cleanup

source/blender/include/BIF_toolbox.h

@@ -115,6 +115,7 @@ short sbutton (char *var, float min, float max, char *str);	/* __NLA */
 int movetolayer_buts (unsigned int *lay);
 void draw_numbuts_tip (char *str, int x1, int y1, int x2, int y2);
 int do_clever_numbuts (char *name, int tot, int winevent);
+void clever_numbuts_buts(void);
 void add_numbut (int nr, int type, char *str, float min, float max, void *poin, char *tip);
 void clever_numbuts (void);
 void replace_names_but (void);