Z3c.table

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- Added translation for ``LinkColumn.linkContent``.

- Added ``I18nGetAttrColumn`` which translates its content.

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- Allow to initialze the column definitions without requiring an
entire table update.

- Fixed tests, so they no longer use ``zope.app.container`` (which was
even not declared as test dependency).

- Head cell contents are now translated.

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- Be smart to not ``IPhysicallyLocatable`` objects if we lookup the
``__name__`` value in columns.

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- Bugfix: Allow to switch the sort order on the header link. This was
blocked to descending after the first click

- Bugfix: CheckBoxColumn, ensure that we allways use a list for compare
selected items. It was possible that if only one item get selected
we compared a string. If this string was a sub string of another existing
item the other item get selected too.

- Moved advanced batching implementation into z3c.batching

- Implemented GetAttrFormatterColumn. This column can be used for simple
value formatting columns.

- Bad typo in columns.py: Renamed ``getLinkConent`` to ``getLinkContent``

- Bug: Changed return string in getLinkCSS. It was using css="" instead of
class="" for CSS classes. Thanks to Dan for reporting this bugs.

- Implemented SelectedItemColumn

- Fix CheckBoxColumn, use always the correct selectedItems. Use always real
selectedItems form the table

- Fix RadioColumn, use always the correct selectedItem from the selectedItems
list. Use always the first selectedItems form the tables selectedItems

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- Initial Release.