Simpletalsix

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This release changes how HTML templates containing entity references and character references are
handled. In previous releases any references contained in the HTML would be passed through to
the output intact. In order to solve the double escaping bug described below all character references
are now expanded in the output with the exception of <, > and &

Bug fixes:
- If multiple variable substitutions are used in a single 'string:' path and one failed
the whole path would evaluate to an empty string.
- When <input name="name"> was used <input name=""> was output.
- The global variable 'attrs' should be a dictionary, not a list
(Thanks to Christoph Zwerschke for the bug report).
- Content accessed through attrs would be double escaped.

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New features:
- Included API documentation and TAL reference guide with archive.

Bug fixes:
- Attributes on repeat tags were not correctly kept for nested repeats.
(Thanks to Aadish Shrestha for the bug report)

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This is release is focused on improving performance. Compared to version 3.8
the performance of expanding templates is ~45-70% faster. The performance of parsing
templates is unchanged.

WARNING: IF you rely on the internal workings of SimpleTALES in your application then
there will be changes that are required to make use of this version of SimpleTAL. The API
for SimpleTAL is however unchanged.

New features:
- Introduced simpleTALUtils.FastStringOutput which can be used to capture the
output of SimpleTAL in a faster manner than StringIO.
- Introduced simpleTALES.CachedFuncResult which can be used to wrap functions in
the Context, and which cache's the result of the function call to ensure that
the function is only called once during template expansion.
- TALES no longer wraps all results in ContextVariable instances when returning
values to TAL.
- Changed copy.copy to {}.copy for performance improvement.
- Removed logging.debug() calls from performance critical paths.
- Replaced DefaultVariable class with simpleTALES.DEFAULTVALUE
- Replaced NothingVariable class with None
- Removed NoCallVariable
- Removed isDefault, isNothing, isSequence, isCallable, and isTrue from ContextVariable.

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New features:
- Added new method getXMLTemplate to simpleTALUtils.TemplateCache
- Comments in XML templates are now included in the output if pyxml is
installed.
- Lists can now be indexed into.

Bug fixes:
- TAL commands on METAL namespaced elements and vice-versa now work correctly
(thanks to Kevin Smith for the bug report).

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New features:
- When non-ascii, non-Unicode strings are present in the Context a Unicode
error is thrown. Now an ERROR log message indicates that this is the most
likely cause of the problem.

Bug fixes:
- Correction to cgi-example (thanks to Frank Wierzbicki for the patch).
- Local defines that reference earlier local defines on one tag now work.
- Using default values in a repeat list now work as expected.
- Errors during codec conversions will now use 'replace' rather than 'strict'

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New features:
- The XML Declaration can now be suppressed by passing
suppressXMLDeclaration=1 to the template "expand" method.
Bug fixes:
- Removed stray 'info' logging call.