Add SLA est. duedate  (only active SLAs)
Add methods to get estimated duedate and sla duedate
Show estimated duedate on ticket view/preview/print.
Factor in duedate (actual & sla) for default overdue queue sort.
Set SLA on transfer *ONLY* when a ticket doesn't have one. Overwriting manually set SLA is the concern here...
Add meta data to SLA names
Consolidate SLAs selection/list.
Init $errors
Merge pull request #466 from protich/feature/duedate+sla

Due dates + SLA