Added validate_new_group to cleaning and removed clean_new_club_link_id.
This new cleaning method is a general purpose method for cleaning the form of a new group or group_app.
Patch by: Lennard de Rijk
Reviewed by: to-be-reviewed
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<head>
<title>500 Server Error</title>
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<body><h1>500 Server Error</h1></body>
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