Added debugging screen to alpha and beta builds. Dev task #73.

briar-api/src/org/briarproject/api/plugins/Plugin.java

@@ -23,6 +23,9 @@ public interface Plugin {
 	/** Stops the plugin. */
 	void stop() throws IOException;
 
+	/** Returns true if the plugin is running. */
+	boolean isRunning();
+
 	/**
 	 * Returns true if the plugin's {@link #poll(Collection)} method should be
 	 * called periodically to attempt to establish connections.

briar-api/src/org/briarproject/api/plugins/PluginManager.java

@@ -2,6 +2,7 @@ package org.briarproject.api.plugins;
 
 import java.util.Collection;
 
+import org.briarproject.api.TransportId;
 import org.briarproject.api.lifecycle.Service;
 import org.briarproject.api.plugins.duplex.DuplexPlugin;
 
@@ -11,6 +12,12 @@ import org.briarproject.api.plugins.duplex.DuplexPlugin;
  */
 public interface PluginManager extends Service {
 
+	/**
+	 * Returns the plugin for the given transport, or null if no such plugin
+	 * is running.
+	 */
+	Plugin getPlugin(TransportId t);
+
 	/** Returns any running duplex plugins that support invitations. */
 	Collection<DuplexPlugin> getInvitationPlugins();
 }