fix ?parentURI and objectName in cdmi output
add deferred evaluation to listings on localstorage

replace the map(), which puts the listing in the correct
format, with a itertools.imap call.
This especially helps cdmi requests, because the listing
is never created when it is not requested by the client.
fix display errors; change layout a bit

- fix the display of the local handle:
    but the display still breaks when the pid is None,
    I can't get it to work with the serializer

- made the local handle a 'detail' of the request
    only shown on the <id> page
- added more steps to the demo script