Ftw.subsite

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- Make subsitelogoviewlet and the fallback logo more robust.
[raphael-s]

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- Make subsitelogoviewlet only search for a subsite logo when the navigation
root actually is a subsite.
[raphael-s]

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- Prevent mobile customizations from loading when ftw.mobile is not installed.
[raphael-s]

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- Add ftw.referencewidget and use it instead of plone.formwidget.contenttree.
[tschanzt]

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- Hide the title of the subsite with CSS.
[mbaechtold]

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- Fix actionmenu selectors to support structors without definition lists.
[mathias.leimgruber]

- Reimplement AT=>DX migration with inplace migrator introduced in
ftw.upgrade 2.0.0. [jone]

- Make ftw.subsite.Subsite linkable in TinyMCE.
[raphael-s]

- Remove "" from simplelayout-view because it is not needed.
[raphael-s]