CPC mode 5 : replaced the global Constraint_mode by a state (Image_mode) in each versioned T_Page: This allows keeping it sane when swapping to Spare, and when Undo/Redoing. Also fixed the first page when program starts, it was unnecessarily allocating pointers for the maximum number of layers(16)/frames(999)

git-svn-id: svn://pulkomandy.tk/GrafX2/trunk@1907 416bcca6-2ee7-4201-b75f-2eb2f807beb1

src/const.h

@@ -564,4 +564,11 @@ enum OPERATIONS
   NB_OPERATIONS                ///< Number of operations handled by the engine
 };
 
+enum IMAGE_MODES
+{
+  IMAGE_MODE_LAYERED=0, ///< Layered image
+  IMAGE_MODE_ANIMATION, ///< Animation
+  IMAGE_MODE_MODE5,     ///< CPC mode 5
+};
+
 #endif