Bug 23594: Batch modification for itemtypes on suggestions page

Bug 23594: Batch modification for itemtypes on suggestions page

This new enhancement adds the ability to update the item types for
selected suggestions on the suggestions management page
(suggestion/suggestion.pl)

To achieve this goal we needed to refresh a bit the template, in order
to get rid of weird code. To not recreate the previous coding awkwardness
some code has been rewritten (mainly the removal of suggestiontype)

Test plan:
- Create some suggestions
- On the suggestions management page, select some of them and a new item
types.
- Submit the form and confirm that the itemtype of the suggestions has
been updated

- Also you should confirm that the "delete" and "change status" still
work as before

Sponsored-by: BULAC - http://www.bulac.fr/
Signed-off-by: Séverine QUEUNE <severine.queune@bulac.fr>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>