Cone.ugm

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- Nothing changed yet.

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- Remove ``expiration`` yafowil blueprint from ``cone.ugm.browser.expires``.
Account expiration is now done with a regular date field since UGM backends
allow setting ``expires`` attributes as datetime objects as of node.ext.ugm
1.1.
[rnix]

- Move ``users_expires_attr`` and ``users_expires_unit`` settings to cone.ldap,
since they always have been used only for LDAP UGM backend.
[rnix]

- Expose ``expires`` attribute of backend user in ``cone.ugm.model.User``.
[rnix]

- Fix general settings form according to changes in yafowil 3.0.
[rnix]

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- Replace deprecated use of ``Nodify`` by ``MappingNode``.
[rnix]

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- Adopt import path of ``safe_decode`` and ``node_path``.
[rnix]

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- Fix ``UsersListing`` and ``GroupsListing`` search filter to ignore
``None`` values.

- Increase listing slice size to 15.
[rnix]

- Add ``change_password`` form.
[rnix]

- Add support for objects events on user and group add/modify/delete.
[zworkb]

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- Fix delete principal.
[rnix]