Documenttemplate

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- Fix broken handling of SyntaxError under Python 3

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- Don't call HTTPExceptions that are looked up in TemplateDicts

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- Restrict the available functions in `DocumentTemplate.sequence` to public
API's of `zope.sequencesort`.

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- LP 143273: Enable the dtml-var modifiers url_quote, url_unquote,
url_quote_plus and url_unquote_plus to handle unicode strings.

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- Released as separate package.