Log Message:
Update to 0.9.9:
- Grayscale native support (PGM format), plus four binarization methods.
- Internal preprocessor including deskewing, balancing, thresholding and
  interpolation (by Giulio Lunati).
- Various new features: border path computing, barcode search,
  detection of extremities, PAGE only mode, the flea, the spyhole,
  instant threshold, per-depth optimized X code, etc.
- Documentation updated (but not finished). Glossary added.
- Many bugfixes and interface enhancements.