rename all migrations to 1.x

db/migrations/1.231_add_files_search_index.php

db/migrations/1.232_step_00315_mvv_i18n.php

db/migrations/1.233_step_00316_mvvkernintegration.php

db/migrations/1.234_add_mkdate_to_statusgruppe_user.php

db/migrations/1.235_tic8335_paper_related_topics.php

db/migrations/1.236_config_public_topics.php

db/migrations/1.237_config_mail_subject.php

db/migrations/1.238_db_updates_for_42.php

db/migrations/1.239_step_00327.php

...grations/1.23_enlarge_object_contentmodules_module_id.php

db/migrations/1.240_tic8538.php

db/migrations/1.241_step_00320_config_search_navigation.php

db/migrations/1.242_tic_8546_search_show_admission_state.php

db/migrations/1.243_tic8773_sort_news_by_chdate.php

db/migrations/1.244_config_default_seats.php

db/migrations/1.245_tic7804_wiki_permissions.php

db/migrations/1.246_consultations.php

db/migrations/1.247_step_00330.php

db/migrations/1.248_step_00331_ilias_interface.php

db/migrations/1.249_lti_consumer.php