items selected (bug 1831).

accidentally inherit one from a base class.

Added _do_dns_lookup_caching class attr to basic user folder.  If this is true.,DNS lookup caching for domain-based restrictions will be performed.  If it's not, DNS lookup caching is bypassed.  It's enabled by default.

Made container and accessed default to aq_parent in _getobcontext.  This was necessary to make the help system work.

stack, to the new DTMLFile.

authentication failure.

- added logic to do domain-defined nobody lookup which I thought I could safely dump before.

- added a hook for ignoring the domain-defined "nobody" lookup, although I'm not going to change the user folder UI right now, and the default behavior of this implementation is the same as the old.

- refactored validate method into identify, authenticate, and authorize methods.

- added _getobcontext method to do acquisition dance to find out accessed, container, and name in order to pass them to securitypolicy.validate

separate function.