Ps-plone-mlstiles

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- Add development collection tile for collective cover.

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- Add freetext search field.
- Fix listing search custom form prefix.
- Fix collection tiles listing retrieval to include configuration of the target collection.

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- Added dependency to ps.plone.mls.
- Added 'Feature Listings' tile.
- I18N updates.

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- Initial release.
- Added tiles for listing collections, recent listings and listing search.