db updates, remove init_connection()

api/index.php

backend.php

classes/db.php

classes/db/mysql.php

classes/db/pgsql.php

classes/idb.php

include/functions.php

index.php

opml.php

plugins/mobile/article.php

plugins/mobile/backend.php

plugins/mobile/cat.php

plugins/mobile/feed.php

plugins/mobile/home.php

plugins/mobile/index.php

plugins/mobile/prefs.php

prefs.php

public.php

register.php

update.php