upgrade PunBB to 1.2.19

lib/punbb/admin_bans.php

lib/punbb/admin_categories.php

lib/punbb/admin_censoring.php

lib/punbb/admin_forums.php

lib/punbb/admin_groups.php

lib/punbb/admin_index.php

lib/punbb/admin_loader.php

lib/punbb/admin_maintenance.php

lib/punbb/admin_options.php

lib/punbb/admin_permissions.php

lib/punbb/admin_prune.php

lib/punbb/admin_ranks.php

lib/punbb/admin_reports.php

lib/punbb/admin_users.php

lib/punbb/delete.php

lib/punbb/edit.php

lib/punbb/extern.php

lib/punbb/footer.php

lib/punbb/header.php

lib/punbb/help.php