Fix up zope.app for new location of zope.traversing.

(also sneaked in some minor cosmetics regarding zapi/ztapi)

interfaces.py

@@ -0,0 +1,29 @@
+##############################################################################
+#
+# Copyright (c) 2002 Zope Corporation and Contributors.
+# All Rights Reserved.
+#
+# This software is subject to the provisions of the Zope Public License,
+# Version 2.1 (ZPL).  A copy of the ZPL should accompany this distribution.
+# THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
+# WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+# WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
+# FOR A PARTICULAR PURPOSE.
+#
+##############################################################################
+"""Folder interfaces
+
+$Id$
+"""
+__docformat__ = 'restructuredtext'
+
+from zope.traversing.interfaces import IContainmentRoot
+from zope.app.container.interfaces import IContainer
+from zope.app.component.interfaces import IPossibleSite
+from zope.app.annotation.interfaces import IAttributeAnnotatable
+
+class IFolder(IContainer, IPossibleSite, IAttributeAnnotatable):
+    """The standard Zope Folder object interface."""
+
+class IRootFolder(IFolder, IContainmentRoot):
+    """The standard Zope root Folder object interface."""