Implement generic get dynamic fields lookup routines

* Set all "route department" filter actions to "unchanged"
* Fix bug in quick-add code where new option was not properly added

- Tickets cannot be closed when an open ticket exists
- Tickets/Tasks cannot be closed when required for close fields are missing
data
- Add isCloseable routine to ticket/task classes

Initially, include support only for Gravatar

Fixes #2328

This patch shores up the new list management feature with the custom list
handler feature written to support lists being saved in a table other than
%list_item, namely the built-in ticket status list.

Also squelch the 'You sure?' popup appearing multiple times.

Restrict view access depending on agent's perm.

Also,
* use current year when no company name exists (yet)
* log a `created` timestamp for new files
* drop table %group during the upgrade

Also fix several javascript errors on ticket edit