Clean work boards

Via clicking menu item File>>New Board on MetaStudio's menu bar, the work boards can be cleaned. From then on, a new data schema can be defined.

On MetaStudio's tool bar, there is an icon. If the icon is presented as a green , the Web page loaded into the embedded browser is just the target page. During defining a data schema, if another page was navigated to, the icon would be changed to red , which means the loaded page is not the target page. In that case, all performed operations would make no sense. The user can switch to the original target via pushing this icon.

If the work boards are cleaned, the icon will be turned to again.