(Apr 22 2010, from branches/stable/0.6.x)
* Support for Python 2.3 has been dropped.
* Rewrite of the XPath evaluation engine for better performance and improved
correctness. This is the result of integrating work done by Marcin Kurczych
during GSoC 2008.
* Updated the Python AST processing for template code evaluation to use the
`_ast` module instead of the deprecated `compiler` package, including an
adapter layer for Python 2.4. This, too, is the result of integrating work
done by Marcin Kurczych during GSoC 2008.
* Added caching in the serialization stage for improved performance in some
cases.
* Various improvements to the HTML sanitization filter.
* Fix problem with I18n filter that would get confused by expressions in
attribute values when inside an `i18n:msg` block (ticket 250).
* Fix problem with the transformation filter dropping events after the
selection (ticket 290).
* `for` loops in template code blocks no longer establish their own locals
scope, meaning you can now access variables assigned in the loop outside
of the loop, just as you can in regular Python code (ticket 259).
* Import statements inside function definitions in template code blocks no
longer result in an UndefinedError when the imported name is accessed
(ticket 276).
* Fixed handling of relative URLs with fragment identifiers containing colons
in the `HTMLSanitizer` (ticket 274).
* Added an option to the `HTMLFiller` to also populate password fields.
* Match template processing no longer produces unwanted duplicate output in
some cases (ticket 254).
* Templates instantiated without a loader now get an implicit