+2007-04-03 Ben Pfaff <blp@gnu.org>
+
+ Apply patches #5828, #5837, #5841, #5843.
+
+ * abt.c (insert_relative): New function.
+ (abt_insert_after): New function.
+ (abt_insert_before): New function.
+
+ * range-map.c: New file.
+
+ * range-map.h: New file.
+
+ * range-set.c: New file.
+
+ * range-set.h: New file.
+
+ * tower.c: New file.
+
+ * tower.h: New file.
+