Assume that text in the database is encoded in UTF-8 and assume that it is
HTML text and the entities should be decoded prior to display in the PDF.

Fixes #756

Also converts ROOT_DIR detection to always use forward slashes. And it fixes
the removal of the leading double-backslash on Windows UNC names (fixes #649)

Add SLA to ticket info table.
Move subject to the top of ticket thread.

Change the with of the info table

Add print options supports - staff can now print a ticket thread without internal notes + select paper size on the fly

Allow staff members the ability to select a default paper size which will be
used in printing tickets via PDF. In the future, this may be overridden per
ticket by a dialog box at print time.