revset: make matching() work on python 2.4

tuple.index() was apparently added to python 2.6:

  http://bugs.python.org/issue1696444

Also remove a trailing comma to make check-code.py happy.

mercurial/revset.py

@@ -952,8 +952,8 b' def matching(repo, subset, x):'
     # We may want to match more than one field
     # Not all fields take the same amount of time to be matched
     # Sort the selected fields in order of increasing matching cost
-    fieldorder = ('phase parents user date branch summary files description'
-                  ' substate').split()
+    fieldorder = ['phase', 'parents', 'user', 'date', 'branch', 'summary',
+        'files', 'description', 'substate']
     def fieldkeyfunc(f):
         try:
             return fieldorder.index(f)