Add ability to select fields / columns to export for queues, including adhoc
searches.

* Export all exportable fields by default - for all queues + adhoc searches
* Export Due Date as well as SLA Due Date

Add ability to add sticky export fields for queues.

This allows a queue to define conditions which apply to the entire row, so
that all the columns in a row can react to a particular condition. For
instance, rows in the ticket queue for tickets due in the near future or
assigned to a particular team could be formatted a certain way.

Adds the ability to "Clone" a queue, which would be nice to create a queue
similar to the current one with a couple distinct settings, but also not a
child of the queue. Also adds the ability to add a "Sub Queue" to the current
queue, which will allow easy creation of queues which are pre-configured for
inheritance.

This adds the ability to add a list of avatars to a column in a ticket
queue.

Also, fix queue paths created at installation time.

Also fix SQL issue with the tables installed in the install script

This patch implements Nathan's mockups for adding sorting options to the
custom queues. The sort drop-down feature was added for v1.10. This patch
adds the complex sort dropdown back into the custom queue feature, but also
makes the sorting options customizable.

And provide a foundation for sorting on other complex field types

Also, avoid setting FLAG_INHERIT_COLUMNS for queues which do not inherit
from another queue.

* Drop per item edit and delete links
* Add drop-down links for edit and delete after queue title
* Fix crash on queues with keyword searches
* Fix menu collapse with several top-level queues. "Search" and "New Ticket"
  are always shown on the nav bar
* Update queue `path` on update
* Include cascaded parent's criteria when displaying inherited criteria
* Show inherited criteria on saved search edit dialog

This fixes a problem where viewing a queue with no defined columns would
result in attempting to add columns to the queue, which would result in an
incorrect SQL statement and an email sent to the administrator. This was
ultimately moot because columns are not added directly to the queue anymore.

Queues can elect to use the columns from a parent. This is enforced by
default for saved searches and queues not defining any columns.

* Fix wrapping issue combining truncated fields with annotations
* Only support criteria inheritance for queues with a parent

The lclip truncate method allows for trimming the beginnging of the text.
This trimming will only work properly for left-to-right languages because it
changes the CSS `direction` property. Writing a rtl language ltr will
probably not be legible.

* Add relative and full formats to the filter list
* All dates in queue are database-relative
* Fix very odd rendering of conditions in queue table
* Fix "clip" truncate mode
* Re-implement background color for Priority column
* Allocate no space for hidden annotations
* Add checkboxes to queue preview for closer resemblance to ticket queue
* Add default formats to initial date columns

This allows for less work when designing new queues. The column design—the
data definition, annotations, and conditions, are saved with the column. The
heading, sort order, and width are set when the column is associated with a
queue. This means that changing the behavior of a particular column will
mean not having to redo work for each queue that uses the column.

This adds support for adding "personal" queues underneath any top-level
queue with automatic criteria inheritance.