File-system themes (a.k.a "global" themes)

Hi!

CPSSkins themes can now be loaded directly from the file-system.
see the demo which shows the entire workflow: 
http://www.z3lab.org/sections/front-page/design-features/file-system-themes-k

this is performed quite simply by first creating them through-the-web 
and by exporting them as a TAR archive, then they can be loaded from any 
package with:

 <configure xmlns:cpsskins="http://namespaces.zope.org/cpsskins">
    <cpsskins:setup site="site-2006-05-06-18.01.47.tgz" />
</configure>

such themes are registered in the global site manager upon server 
startup. Use cases are for applications whose appearance needs not be 
modified through-the-web. Portlets located in slots are supported too 
since they're not stored in local folders but stored in a central 
portlet "repository".

Theoretically global themes can be modified, but there is no point in 
modifying them when the server is in production, since they're volatile 
and ZEO-based setups would get out-of-sync.

However there is a case where modifying them in RAM would make sense, 
i.e. when developing a site collaboratively; indeed it is trivial to 
implement automatic reloads from the file-system on svn updates for 
instance...

/JM