Log Message:
Update to 0.9.23:

Overview of changes leading to 0.9.23
Monday, October 28, 2013
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- "Udupi HarfBuzz Hackfest", Paris, October 14..18 2013.
- Fix (Chain)Context recursion with non-monotone lookup positions.
- Misc Indic bug fixes.
- New Javanese / Buginese shaping, similar to Windows 8.1.