Silva-core-contentlayout

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- ...

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- Make possible to edit settings in SMI

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- Update tests to be ran inside a transaction to ensure the last
author is properly set.

- Update to use new icon API.

- Improve tests.

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- Update tests.

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- Fix compatilbility with jQuery 1.9.

- Fix various Silva XML improt and export issues when the models are
not exported with the content, missing or others settings differs.

- Prevent to select as design for a model the same model or a model
used by the current model, preventing loops.

- Improve slot block user interface.

- Improve tests.

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- Fix compatiblity with JQuery 1.8. This is the minimum required
version now.

- Fix persistence of the block slot (for model). Modifications were not
saved.

- Update Silva XML import and export API.