Register plugin in Spyder's main window

def register_plugin(self):
        """Register plugin in Spyder's main window"""
        main = self.main
        main.add_dockwidget(self)

        #if getattr(main.projectexplorer, 'sig_project_closed', False):
        #    pe = main.projectexplorer
        #    pe.condamanager = self
        #    pe.sig_project_closed.connect(self.project_closed)
        #    pe.sig_project_loaded.connect(self.project_loaded)
        #    self.sig_worker_ready.connect(self._after_load)
        #    self.sig_environment_created.connect(pe.sig_environment_created)

        self.sig_channels_updated.connect(self._save_channel_settings)