Collective.portlet.mybookmarks

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- Nothing changed yet.

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- Drop python 2 and Plone < 5.2 support.
[cekk, axaroth]
- Python 3 compatibility.
[cekk, axaroth]

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- Always show edit bookmarks link in bookmarks list, also if the user doesn't
have any bookmark.
[cekk]

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- Don't show bookmark action on site root
[cekk]
- Use standard slots in edit template
[cekk]

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- Fix Italian translations.
[cekk]

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- remove userschema.xml. Now additional field is added in the install script.
In this way, we don't override existing ones.
[cekk]