Simplelayout-portlet-dropzone

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- Nothing changed yet.

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- Add simplelayout.base.listingPortlet.body viewlet to a viewlet order manager
to fix ordering bug when ordering viewlets in relation with this viewlet.
[elioschmutz]

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- Reduce empty space in dropzone portlet listing.
[jone]

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- Implement an editable css klass.
[mathias.leimgruber]

- Code cleanup (remove whitespaces).
[mathias.leimgruber]

- Implement emptymarker css klass.
[mathias.leimgruber]

- CSS: remove overflow hidden.
[mathias.leimgruber]

- Move package to github.
[jone]

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- make simplelayout.base > 2.0rc5 compatible
[mathias.leimgruber]