Bug 35597: logaction when modifying or deleteing suggestions

Bug 35597: logaction when modifying or deleteing suggestions

To test:
1. Apply patch, restart services, updatedatabase
2. Search for the system preference 'SuggestionsLog', it should be off.
   Turn it on.
3. Create a purhase suggestion
4. Go to Tools > Log viewer. In modules check 'Suggestions'
5. You should see your newly created suggestion.
6. Modify the suggestion and check the logs again, the modification
   should be logged.
7. Delete the suggestion, the deletion should be logged.
8. Do a purchase suggestion via the OPAC.
9. Check the logs to see the newly created suggestion, the interface
   should be OPAC.
10. Turn of SuggestionsLog
11. No changes of any kind should be logged.

Signed-off-by: Owen Leonard <oleonard@myacpl.org>
Signed-off-by: Ray Delahunty <lib-systems@arts.ac.uk>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>