Rearrange code & clean up extra debug messages
Add translation support where it makes sense for default settings.
Add translation support for more error messages
Reminders for transitioning from stdObject for sequence posts to using either flat postmeta or add function to support pulling posts in sequence using 'IN ()'
Clean up SQL queries and use $wpdb->prepare() + variables (when possible)
Add empty labels
Clean up the getPostListFromDB() function (more obvious where the post types & statuses of interest are coming from)