Chameleon

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Features:

- The exception formatter now lists errors in 'wrapping order'. This
means that the innermost, and presumably most relevant exception is
shown last.

Bugfixes:

- The exception formatter now correctly recognizes nested errors and
does not rewrap the dynamically generated exception class.

- The exception formatter now correctly sets the ``__module__``
attribute to that of the original exception class.

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Features:

- Added support for code blocks using the `<?python ... ?>` processing
instruction syntax.

The scope is name assignments is up until the nearest macro
definition, or the template itself if macros are not used.

Bugfixes:

- Fall back to the exception class' ``__new__`` method to safely
create an exception object that is not implemented in Python.

- The exception formatter now keeps track of already formatted
exceptions, and ignores them from further output.

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- The error handler now invokes the ``__init__`` method of
``BaseException`` instead of the possibly overridden method (which
may take required arguments). This fixes issue 97.
[j23d, malthe]

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Bugfixes:

- The trim whitespace option now correctly trims actual whitespace to
a single character, appearing either to the left or to the right of
an element prefix or suffix string.

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Features:

- Added option ``trim_attribute_space`` that decides whether attribute
whitespace is stripped (at most down to a single space). This option
exists to provide compatibility with the reference
implementation. Fixes issue 85.

Bugfixes:

- Ignore unhashable builtins when generating a reverse builtin
map to quickly look up a builtin value.
[malthe]

- Apply translation mapping even when a translation function is not
available. This fixes issue 83.
[malthe]

- Fixed issue 80. The translation domain for a slot is defined by the
source document, i.e. the template providing the content for a slot
whether it be the default or provided through ``metal:fill-slot``.
[jcbrand]

- In certain circumstances, a Unicode non-breaking space character would cause
a define clause to fail to parse.

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Features:

- Enable expression interpolation in CDATA.

- The page template class now implements dictionary access to macros::

template[name]

This is a short-hand for::

template.macros[name]

Bugfixes:

- An invalid define clause would be silently ignored; we now raise a
language error exception. This fixes issue 79.

- Fixed regression where ``${...}`` interpolation expressions could
not span multiple lines. This fixes issue 77.