Protege 2.1 Beta update (build 193)

There's a new beta build available on our Web site: 
http://protege.stanford.edu/download/prerelease/index.html

Changes
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1. Moved Frame.setVisible method to Cls since it really doesn't work on 
other frame types.

2. Raised visibility of PluginUtilities.processManifest() to public.

3. The constraints slot widget no longer allows values to be set on 
included classes and the default back-end no longer stores these values.

4. Implemented support for the new "Project Plug-in" type that allows a 
plug-in author to manipulate projects and the Protege UI as they are 
created.  Documentation for this plug-in type is available on our Web site: 
http://protege.stanford.edu/doc/pdk/plugins/project_plugin.html.

5. Implemented support for localization of text from the core Protege 
system and for plug-ins.  This support is documented on our Web site: 
http://protege.stanford.edu/doc/resource_bundles.html.

6. Fixed problem with "errors window" going to the back on load.

7. Fixed problem which caused duplicate delete class events.