Properly KIO::stat instead of simply using the KFileItem constructor when

Properly KIO::stat instead of simply using the KFileItem constructor when
showing metadata for the currently selected folder. This way we can even get rid of the
special handling of nepomuksearch:/ URLs since the KIO slave provides a nice name and
all you need to show to the user.
Even nicer: When clicking an entry in the metadata view the resulting query will be related
to the one clicked resource. This resource will then be represented by the query folder.
So all in all this patch makes Dolphin more generic while additionally activating a new feature.

svn path=/trunk/KDE/kdebase/apps/; revision=1152959