Detach conversation thread from ticket to make it more generic. Any object
can now have its own thread complete with entry type and attachments.

The commit also renames some fields in department table.

The commit also renames some fields in department table.

This patch adds support for automatic date and time formatting based on a
selection of locale. The locale can default to the system or user specified
language+locale, or can be elected separately. For instance, English
speakers can pick between US, GB, and many other English speaking locales.

This also removes the need of the %timezone table and uses the timezonedb
built into PHP 5.3+. User's can now select from a much longer list of
database and no longer need to deal with the DST checkbox.

Previously we required an account to associate a user to an organization.

This is necessary so we can use the templates to show tickets assoaciated
with user as well as organization by simply switching the context.