Added threading, progress and some comments, nearly done

Joel Grunbaum

2020-10-21 8e7ea6742a94ea62b421d7184e9eab17fb5da934

 slist.c

@@ -65,6 +65,8 @@
    return 0;
}

// Sort with merge sort as works well for linked lists
// Copied from https://www.geeksforgeeks.org/merge-sort-for-linked-list/
int sort_servers(struct dns_list **headRef)
{
   struct dns_list *head = *headRef;