work on new eval-viz layer stringification which factors out measurement/limiting/etc., but just walks an eval tree and stringifies each part; start working on new types <-> lookup-rule stuff

src/eval/eval_core.h

@@ -274,11 +274,10 @@ enum
 {
   E_TypeFlag_Const            = (1<<0),
   E_TypeFlag_Volatile         = (1<<1),
-  E_TypeFlag_External         = (1<<2),
-  E_TypeFlag_IsPlainText      = (1<<3),
-  E_TypeFlag_IsCodeText       = (1<<4),
-  E_TypeFlag_IsPathText       = (1<<5),
-  E_TypeFlag_EditableChildren = (1<<6),
+  E_TypeFlag_IsPlainText      = (1<<2),
+  E_TypeFlag_IsCodeText       = (1<<3),
+  E_TypeFlag_IsPathText       = (1<<4),
+  E_TypeFlag_EditableChildren = (1<<5),
 };
 
 typedef struct E_Member E_Member;