Fixed MANTIS-5766 (Many missing addon guards)

adminzone/pages/modules/admin_points.php

site/pages/modules/groups.php

sources/blocks/main_cns_involved_topics.php

sources/cns_install.php

sources/cns_join.php

sources/cns_members_action2.php

sources/cns_polls.php

sources/cns_polls_action2.php

sources/cns_posts.php

sources/cns_posts_action.php

sources/cns_posts_action2.php

sources/hooks/systems/cron/points_posts.php

sources/hooks/systems/fields/state.php

sources/hooks/systems/points/banner__add.php

sources/hooks/systems/points/catalogue_entry__add.php

sources/hooks/systems/points/chat_message__add.php

sources/hooks/systems/points/comcode_page__add.php

sources/hooks/systems/points/download__add.php

sources/hooks/systems/points/download__download.php

sources/hooks/systems/points/event__add.php