Alternate fix for Bug 2534 - Viewing items table on item edit screen requires horizon...

Alternate fix for Bug 2534 - Viewing items table on item edit screen requires horizontal scrolling

This patch doesn't eliminate horizontal scrolling, but simplifies
the situation:

- The left-hand sidebar has been moved below the table of items.
- The "overflow:scroll" style has been removed from the table of items.
  Having overflow set meant that it was often necessary to scroll twice
  to reach data in the table: once using the scrollbars on the table
  and again using the page's scrollbars.

The NEKLS catalogers also extend their thanks for this fix.

Signed-off-by: Liz Rea <lrea@nekls.org>
Signed-off-by: Ian Walls <ian.walls@bywatersolutions.com>
Signed-off-by: Chris Cormack <chrisc@catalyst.net.nz>