GGW_ext but not working yet: the passed article (HtmlElement) is not compatible with the GWT class ArticleElement

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@23079 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Update CAS cells when Web's CAS is loaded

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@23080 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e