#12 auto sort ticket by status

On the ticket list all the tikets are displayed, after a few weeks it's all filled with a lot of closed tickets and this point is a bit difficult to see what it the pending job.

it will be more convenient to :
- Display only open tickets by default
- have links after "add a ticket" who connect to other status.

Ex :
+ Add a Ticket | Open tickets | Closed tickets | etc...