Whole lot of changes.... here a shortlist:

- removed editors/area and put this all in screen
- added first python calls (note, a new c file for scriptlinks)
- added view3d editor callbacks (no drawing yet)
- added files in editors/interface

(Cmake and Scons has to be fixed, help welcome!)

- now areas/headers are being converted on file read
- note: previously saved 2.50 files will crash!!! (.B.blend)
- area regions are being drawn, first handler for cursor added (on edge)
- window duplicate and scale works correct for screen subdiv

Todos for me:

- need to fix things in syntax (function names) a bit still
- more operators for screen
- define how Context will work... still unresolved when it gets set
- docs!

Reviews of code structure is welcome!
There are also more todos now for others, but it can wait a couple of days

source/blender/editors/include/ED_screen.h

@@ -29,6 +29,33 @@
 #define ED_SCREEN_H
 
 #include "DNA_screen_types.h"
+#include "DNA_space_types.h"
+#include "DNA_view2d_types.h"
+#include "DNA_view3d_types.h"
+
+struct wmWindowManager;
+struct wmWindow;
+struct wmNotifier;
+
+/* regions */
+void	ED_region_do_listen(ARegion *ar, struct wmNotifier *note);
+void	ED_region_do_draw(struct bContext *C, ARegion *ar);
+void	ED_region_do_refresh(struct bContext *C, ARegion *ar);
+
+/* spaces */
+void	ED_spacetypes_init(void);
+
+/* areas */
+void	ED_area_initialize(struct wmWindowManager *wm, struct wmWindow *win, struct ScrArea *sa);
+
+/* screens */
+void	ED_screens_initialize(struct wmWindowManager *wm);
+void	ED_screen_draw(struct wmWindow *win);
+void	ED_screen_refresh(struct wmWindowManager *wm, struct wmWindow *win);
+void	ED_screen_do_listen(bScreen *screen, struct wmNotifier *note);
+bScreen *ED_screen_duplicate(struct wmWindow *win, bScreen *sc);
+
+void	ed_screen_keymap(struct wmWindowManager *wm);
 
 #endif /* ED_SCREEN_H */