allow copying of participants and groups when copying a course, fixes #3441

app/controllers/course/statusgroups.php

app/controllers/course/wizard.php

app/views/course/statusgroups/copy.php

app/views/course/statusgroups/index.php

app/views/course/wizard/summary.php

lib/classes/AuthenticatedController.php

lib/classes/QuickSearch.php

lib/classes/coursewizardsteps/BasicDataWizardStep.php

lib/classes/searchtypes/StandardSearch.php

lib/models/Statusgruppen.php

resources/assets/javascripts/lib/dialog.js