- Some cleanup for Search Engine APIs. More consistent usage of not-found case via new `ap' argument.
- Fix word matching type.
- Fixes for multi-stage search processing.
- Distinct `hitlist' (marshalled bit vector in the DB) and HitSet class.
- When no match found, try to remove non-alphanumeric chars, add also the end of the words. (The ``Todesco, E'' problem.)
- Fixes for mod_python Request object display (when not in HTML output format).