Include collaborated tickets
Pagenate user and org tickets listing
Add ability to export tickets

Fixes a bug where a lock icon is shown on tickets listing even when the lock
in question is expired.

Load and cache all the attachments on a thread prior to rendering the items.
That removes the need to run a query per thread item to check for- and fetch
attachments.

This feature allows (by option) an organization to allow its members to see
tickets from other members. It can be used beside or instead of the
automated collaboration feature. Now, collaborators retain access to tickets
on which they participate; however, sharing can be used to enable access to
other tickets owned by their organization.

Fixes #2350 in `develop`

This time, use full-text for user and ticket lookup boxes, and drop the
full-table scans from the ticket basic search page. Auto promote searches to
wildcard searches when searching with the user-supplied input yields no
results.

Also, apply requested state to the user and organization tickets search.

If the subject field is something crazy, such as an HTML field, ensure that
the layout of the ticket queue is preserved and properly truncated.
Furthermore, ensure that the HTML is properly rendered on the client and
staff ticket view pages.

Fixes #2410

The system would encode 'access -related' as 'access+-related' when changing
the sorting preference and would crash the query. This patch fixes the
search engine code to avoid a BOOLEAN MODE search when improper operators
are used in the query terms, and it fixes the sorting preference system to
properly decode the '+' to a space when rewriting the URL.

Drop the 25 rule limit

Adjusted all tables to use % instead of px.

Styled dashboard page.