tokuftdump should print leaf entry index so that the dump is easier to work with

tools/tokuftdump.cc

@@ -248,6 +248,8 @@ static int64_t getRootNode(FT ft) {
 }
 
 static int print_le(const void* key, const uint32_t keylen, const LEAFENTRY &le, const uint32_t idx UU(), void *const ai UU()) {
+    unsigned int *le_index = (unsigned int *) ai;
+    printf("%u: ", *le_index); *le_index += 1;
     print_klpair(stdout, key, keylen, le);
     printf("\n");
     return 0;
@@ -537,7 +539,8 @@ static void dump_node(int fd, BLOCKNUM blocknum, FT ft) {
             printf(" n_bytes_in_buffer= %" PRIu64 "", BLB_DATA(n, i)->get_disk_size());
             printf(" items_in_buffer=%u\n", BLB_DATA(n, i)->num_klpairs());
             if (do_dump_data) {
-                BLB_DATA(n, i)->iterate<void, print_le>(NULL);
+                unsigned int le_index = 0;
+                BLB_DATA(n, i)->iterate<void, print_le>(&le_index);
             }
         }
     }