updated for version 7.3.591
Problem:    Can only move to a tab by absolute number.
Solution:   Move a number of tabs to the left or the right. (Lech Lorens)
diff --git a/src/window.c b/src/window.c
index c65f49d..6460684 100644
--- a/src/window.c
+++ b/src/window.c
@@ -3929,7 +3929,7 @@
     }
 
     /* Re-insert it at the specified position. */
-    if (n == 0)
+    if (n <= 0)
     {
 	curtab->tp_next = first_tabpage;
 	first_tabpage = curtab;