Silvatheme-standardissue

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* ...

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* Add CSS for table styles.

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* Add default silva image styles.

* Include public form CSS from ``zeam.form``.

* Minimize resources.

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* Update to use Chameleon templates in Silva 3.0.

* Improve template efficienty.

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* Update CSS for forms and news items.

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* Update CSS for forms. Remove SilvaForum CSS (this goes in SilvaForum).

* Fix search field by specifying a valid URL to post the search criteria.

* Update the favicon customization.

* Various CSS changes.