The ''Clone'' button is placed in the ticket box, next to the ''Reply'' one.
Note that this request uses a ''post'' method and not a ''get'' because using ''get'' doesn't work well with IE and Opera (previewing or saving a cloned ticket will fail).
Though there's no special right needed besides TICKET_CREATE, this feature is mainly useful only for TICKET_ADMINs that have to track the same issue in different line of development, so the feature will only be available to them.
