cleanup: rename all iteritems methods to items and add iteritems alias

Due to a quirk of our module importer setup on Python 3, all calls and
definitions of methods named iteritems() get rewritten at import
time. Unfortunately, this means there's not a good portable way to
access these methods from non-module-loader'ed code like our unit
tests. This change fixes that, which also unblocks test-manifest.py
from passing under Python 3.

We don't presently define any itervalues methods, or we'd need to give
those similar treatment.

mercurial/dirstate.py

@@ -343,9 +343,11 b' class dirstate(object):'
         for x in sorted(self._map):
             yield x
 
-    def iteritems(self):
+    def items(self):
         return self._map.iteritems()
 
+    iteritems = items
+
     def parents(self):
         return [self._validate(p) for p in self._pl]
 

mercurial/manifest.py

@@ -579,9 +579,11 b' class manifestdict(object):'
         c._lm = self._lm.copy()
         return c
 
-    def iteritems(self):
+    def items(self):
         return (x[:2] for x in self._lm.iterentries())
 
+    iteritems = items
+
     def iterentries(self):
         return self._lm.iterentries()
 
@@ -788,7 +790,7 b' class treemanifest(object):'
                 for x in n.iterentries():
                     yield x
 
-    def iteritems(self):
+    def items(self):
         self._load()
         for p, n in sorted(itertools.chain(self._dirs.items(),
                                            self._files.items())):
@@ -798,6 +800,8 b' class treemanifest(object):'
                 for f, sn in n.iteritems():
                     yield f, sn
 
+    iteritems = items
+
     def iterkeys(self):
         self._load()
         for p in sorted(itertools.chain(self._dirs, self._files)):

mercurial/namespaces.py

@@ -66,9 +66,11 b' class namespaces(object):'
     def __iter__(self):
         return self._names.__iter__()
 
-    def iteritems(self):
+    def items(self):
         return self._names.iteritems()
 
+    iteritems = items
+
     def addnamespace(self, namespace, order=None):
         """register a namespace