Collective-themefragments

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- Add ++themefragment++name -traverser to allow direct use of themefragments as
views
[datakurre]

- Add fragment Python module support for fragment tile
[datakurre]

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- Add support for fragment Python modules (as PEP8 compatible single file
replacement for fragment methods support in previous versions)
[datakurre]

- Change to make templates owned by their creator instead to inherit owner from
their rendered context
[datakurre]

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- Add traversable output_relative_to helper for RichTextValue object to
support rendering rich text field values in restricted templates
[datakurre]

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- Fix issue where fragment tile URL did not include selected fragment itself
[datakurre]

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- Fix issue where add form was unable to use fragment name from request
[datakurre]

- Fix to filter comments beginning with '' when reading tile titles
[datakurre]

- Remove incomplete support for persistent annotation storage for theme
fragment tiles
[datakurre]

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- Fix to read fragment name from tile data before selecting cache rule
[datakurre]