Selecting entire queue view with one click.

[Ryan C. Gordon]

The cell in the upper right corner of the queue view, which used to be an
'X', is now a checkbox that runs some javascript to select/deselect all
visible news items, in case you need to do a mass delete/purge/approve.
After (de)selecting everything, you can tweak individual checkboxes for
each news item.

Non-javascript browsers (or those with Javascript disabled) will get the
good ol' fashion 'X' still.

--ryan.