The ORM will cache the structure of the underlying tables (fields and such)
in APC, and will needs to ensure such data is purged when the table
structures change.

This adds ability to delete properties on list deletion

This patch (which needs further development), introduces an extra field to
the %attachment table to store a file's name, in the event that two files
with the same content are stored in the database with differing names. In
such a case, the name is stored in the %attachment table. This allows the
attachment to specify a different name each time the same file is attached
to something in the system.

* Rename config var enable_html_thread to enable_richtext
* Copy config var name_format to agent_name_format and client_name_format
  and delete it

This stems from a bug not clearing the org_id when removing organizations

Also make forms deleteble by marking them as deleted and hiding them from
the form listing. This ensures that custom data always has a link back to
the form.

These fields have been consolidated into the `flags` column.

Add Agents and Users setting pages
Move global settings to System settings

* Fix crash saving a page (regression)
* Fix red banner deleting a department
* Fix crash deleting a knowledgebase article

Also fix crash rendering db timezone on PHP 5.3

* Fix attachments not sticking on new dynamic form entry
* Fix attachments not sticking on thread post validation error
* Fix missing inline images in FAQ article viewing
* Fix missing inline images in FAQ article printing
* Fix crash rendering sidebar in staff faq view with attachments
* Rewrite GenericAttachments to be an ORM object
* Port CannedResponse to ORM
* Fix attachments not being displayed when editing a FAQ article
* Fix squirly empty blue box on faq articles with no attachments

Also, fix clearing users in an organization when removing the organization.

This patch attempts to query or detect the Olson style timezone
(e.g. America/Chicago) from the database. This is preferred over the
previous code as the previous code would always consider the current
database GMT offset rather than the GMT offset of the date being converted
(which might be on the other side of a DST transition).

This fixes a bug where the search queue would be empty when accessing it via
the navigation link