Zeam.form.silva

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* ...

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* Add classes to create forms for Silva services in SMI.

* Improve the upload widget when a clear button is displayed.

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* Implement a new upload widget based on a different extension than before.

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* Add a specific template and CSS for public form.

* Update SMI templates.

* Update javascript to support jQuery 1.9.

* Improve ID widget.

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* Fix inline validation that was not activated inside dialogs.

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* Update ID widget to work in a Zope context (for the *Add a Silva
Root* Zope homepage).

* Update default z-index for the upload widget, in order to make it
usuable via the reference windows inside the text editor.