Update FPDF library to v1.7 (2011-06-18)
Import tFPDF
Set UTF8 mode for database connection
Add UTF-8 Support to ballot papers

If PHP's mbstring extension is available, use that to generate ballots
using tFPDF.

A warning is issued at install time if mbstring is unavailable, and tabbie
will revert to using FPDF and transliterated/replacement characters