Added delete/undelete.

- when moving a point, we no longer restrict the area around the original
  position once the drag radius has been left
- objects can now be deleted by selecting them and pressing Delete
- deleted objects can be restored by pressing "u"



git-svn-id: http://svn.openmoko.org/trunk/eda/fped@5387 99fdad57-331a-0410-800a-d7fa5415bdb3

obj.h

@@ -14,6 +14,7 @@
 #ifndef OBJ_H
 #define OBJ_H
 
+#include <assert.h>
 #include <gtk/gtk.h>
 
 #include "expr.h"
@@ -161,6 +162,7 @@ struct obj {
 		struct arc arc;
 		struct meas meas;
 	} u;
+	struct frame *frame;
 	struct vec *base;
 	struct obj *next;
 	int lineno;
@@ -180,6 +182,15 @@ static inline struct vec *get_vec(struct vec *vec)
 }
 
 
+static inline void put_vec(struct vec *vec)
+{
+	if (vec) {
+		assert(vec->n_refs);
+		vec->n_refs--;
+	}
+}
+
+
 int instantiate(void);
 
 #endif /* !OBJ_H */