Reverse query to report owners with 0 patches merged

No wonder they were not reported: we were looking for those with less than 5
merged patches among those with merged patches. Quick solution is reversing
the query, probably not the most efficient way or maybe yes if newbies grow
more than serial patchers.

reports/open-changesets-by-owner-newbie.py

@@ -45,12 +45,12 @@
  SUM( gc_project == 'mediawiki/core' ) as open_core
 FROM changesets
 WHERE gc_status = 'NEW'
-AND gc_owner IN (
+AND gc_owner NOT IN (
  SELECT gc_owner
  FROM changesets
  WHERE gc_status = 'MERGED'
  GROUP BY gc_owner
- HAVING COUNT( gc_owner ) < 5
+ HAVING COUNT( gc_owner ) >= 5
 )
 GROUP BY gc_owner;
 ''')