Bug 9307 - Allow libraries to add/edit status for suggestion management.

This patch allows for the addition of new suggestion status by adding
authorised values of the category SUGGEST_STATUS

I sign it off. Details of my test plan :
1. Applying the patch
2. Checking existing suggestions, in staff view and opac :  ok
3. Creating a new suggestion in staff and in opac :  ok
4. Moving a suggestion into one of the old categories : ok
5. Adding a new authorized value category named SUGGEST_STATUS and fill it with 3 values :
value    Description    Description (OPAC) =)>
tata    tatapro         tataopac
titi    titipro         titiopac
toto    totopro         totoopac
For "tata", I defined a branch restriction on branche B.
6. Connecting in staff interface as a librarian of branch A : I could only use codes titipro and totopro. On OPAC, these codes were displayed as totoopac and titiopac
7. Connecting as librarian of branch B : I could use the 3 codes
8. Checking tabs visible : new tabs for tata, titi, toto, but also a new "Unknown" tab with 0 record.

Maybe point 8 could be fixed in a followup.
I sign off the patch.

Signed-off-by: Mathieu Saby <mathieu.saby@univ-rennes2.fr>

Signed-off-by: Jonathan Druart <jonathan.druart@biblibre.com>
Bug 9307: QA Followup

- Remove an old DHTMLcalendar_dateformat variable
- Add SUGGEST_STATUS to the "Koha system categories"

Signed-off-by: Jonathan Druart <jonathan.druart@biblibre.com>
Bug 9307: (follow-up) help text tweaks

- per bug 10420, use 'authorized'
- add a period