beautify media upload window

This patch cleans up the media upload window. Although the
namespace list makes levels clear through indention,
sub-namespaces were always printed with full path. This
redundant information have been removed to save space.
This space was added to the objects list on the right side.

darcs-hash:20050517175546-7ef76-1c86eb762e0b44dc4960062524cda6554befbcea.gz