Ftw.publisher.core

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- Replace "is_sl_contentish" function with "belongs_to_parent".
This requires an update of `ftw.publisher.sender` to the compatible
version. The new implementation is more generic. [jone]

- Replace the Simplelayout-specific "RemoveDeletedSLContentishChildren"
adapter with a generic "RemoveChildren" adapter so that it also works
for other kind of content, such as PloneFormGen. [jone]

- Improve ``ftw.trash`` integration regarding deleted content. [jone]

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- Add support for ftw.trash with simplelayout [mathias.leimgruber]

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- Add support for Plone 5.1. [Nachtalb, jone, mbaechtold]

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- Handle broken relations properly. [jone, mbaechtold]

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- Add utils function to make a relative path absolute. [raphael-s]

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- Support datagrid GridRow serialization/deserialization of RelationValues [mathias.leimgruber]
- No longer install "splinter" extra from "ftw.testing". [mbaechtold]