automv: access status fields by name, not index

Differential Revision: https://phab.mercurial-scm.org/D6586

hgext/automv.py

@@ -81,8 +81,8 b' def _interestingfiles(repo, matcher):'
 
     """
     stat = repo.status(match=matcher)
-    added = stat[1]
-    removed = stat[2]
+    added = stat.added
+    removed = stat.removed
 
     copy = copies.pathcopies(repo['.'], repo[None], matcher)
     # remove the copy files for which we already have copy info