And two flags, one which signals that stored HTML is correctly balanced and
does not need to be balanced when rendered in the ticket view. The second is
used to signal messages received from collaborators.

Additionally, this patch fixes showing external inline images (via the [Show
Images] button) when clicked.

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