OpenACS

This change is necessary for minimal setups, e.g. for plain installs

during regression test, when no bootstrap packages are available.

- define yui as last-resort fallback for "toolkit"

- handle CSS class composition for YUI as well

 (merge of class-specific and item specific CSS classes,

 used for color management for publish status button)

- remove underline for publish-status in YUI mode

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