[consider merging] Bugfix on Plugin registration

This bug happened when a plugin package was installed. In
this case, the plugin was installed dynamically. The effect
was for example that the grid in a view became invisible.
Problem was, that the plugin registration re-generated all
plugins from the view, but did not reconfigure them. Hence
the grid had the default setting which was invisible grid.

src/laybasic/laybasic/layPlugin.cc

@@ -301,6 +301,7 @@ PluginDeclaration::register_plugin ()
   if (Dispatcher::instance ()) {
     Dispatcher::instance ()->plugin_registered (this);
     initialize (Dispatcher::instance ());
+    Dispatcher::instance ()->config_setup ();
   }
 }