patch 7.4.1719

Problem:    Leaking memory when there is a cycle involving a job and a
            partial.
Solution:   Add a copyID to job and channel.  Set references in items referred
            by them.  Go through all jobs and channels to find unreferenced
            items.  Also, decrement reference counts when garbage collecting.

src/regexp.c

@@ -7910,7 +7910,7 @@ reg_submatch_list(int no)
 
     if (error)
     {
-	list_free(list, TRUE);
+	list_free(list);
 	return NULL;
     }
     return list;