Add notices about outdated sup tutorials

...EN/sup_a_detailed_look_at_the_composr_calendar_system.txt

...m/EN/sup_add_a_booking_system_to_your_composr_website.txt

...pages/comcode_custom/EN/sup_add_a_chatroom_to_composr.txt

...mcode_custom/EN/sup_add_a_download_library_in_composr.txt

..._custom/EN/sup_add_a_new_poll_to_your_composr_website.txt

...pages/comcode_custom/EN/sup_add_a_new_zone_in_composr.txt

...e_custom/EN/sup_add_a_sub_forum_to_your_composr_forum.txt

...code_custom/EN/sup_add_a_survey_to_an_composr_website.txt

...ode_custom/EN/sup_add_a_twitter_feed_block_to_composr.txt

...pages/comcode_custom/EN/sup_add_shoutboxes_to_composr.txt

...N/sup_adding_an_activity_feed_to_your_composr_website.txt

...mcode_custom/EN/sup_adding_an_image_slider_to_composr.txt

..._custom/EN/sup_adding_banners_to_your_composr_website.txt

...code_custom/EN/sup_adding_new_page_options_in_composr.txt

...ages/comcode_custom/EN/sup_an_introduction_to_composr.txt

...ode_custom/EN/sup_an_overview_of_galleries_in_composr.txt

...de_custom/EN/sup_backing_up_your_composr_installation.txt

...ages/comcode_custom/EN/sup_catalogue_field_references.txt

docs/pages/comcode_custom/EN/sup_catalogues.txt

...ges/comcode_custom/EN/sup_changing_the_composr_forums.txt