Log Message:
Update swath to 0.4.3.

0.4.3 (2012-06-13)
=====
- Replace word break dictionary with the word lists used to prepare
  hyphenation patterns for the upcoming ThaiLaTeX, for best results.

0.4.2 (2012-02-08)
=====
- Fix wrong word break within punctuation sequences like LaTeX `` and ''.
- Reformat source for readability.
- Significant source clean-ups.