Collective.portlet.relateditems

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- Related items use image tile instead of thumb.

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- Minor changes regarding the dates of events.

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- Bug fix.
- Added classes to improve CSS.

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- Bug fix: hard dependency to contentleadimage removed.

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- Bug fix: files types like Image and File did not appeared in sea.
- Bug fix: portlet rendered bug in admin pages.
- Bug fix: title of non folder items (with references) was not included in the search.

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- Bug fix: related items did not appear in some collections.