Resolve FIXME but without fixing the issue

I tried to make this work but it might need a more thorough rewrite that I just cannot do.

The worst that can happen is stopping and starting Helma apps adding redundant ServletContextHandlers to the ContextHandlerCollection until Helma is restarted.

src/main/java/helma/main/ApplicationManager.java

@@ -563,8 +563,8 @@ public class ApplicationManager implements XmlRpcHandler {
                 // unbind from Jetty HTTP server
                 if (ApplicationManager.this.jetty != null) {
                     if (this.appContext != null) {
-                        // FIXME: Causing incompatible types: ServletContextHandler cannot be converted to Handler
-                        // Is it necessary, anyway?
+                        // Adding appContext to the ContextHandlerCollection works (see above) but removing it causes an exception of
+                        // incompatible types: ServletContextHandler cannot be converted to Handler
                         //ApplicationManager.this.context.removeHandler(this.appContext);
                         this.appContext.stop();
                         this.appContext.destroy();