Fix for Bug 4498 - Acq always shows '1 suggestions waiting'

Fix for Bug 4498 - Acq always shows '1 suggestions waiting'

- Removing 'suggestions waiting' link from left-hand menu. A plain
  'suggestions' link is still shown if suggestions are enabled.
- Putting back the 'pending suggestions' box that used to appear
  on the Acquisitions home page. This will show, with a count
  of pending suggestions, only if suggestions are turned on and
  there are pending suggestions.

Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>
Signed-off-by: Chris Cormack <chrisc@catalyst.net.nz>