Convert the get_fields function to get_field_html
remove the concept of an indeterminate set of visibility fields and commit to a single visibility select box
Added post meta box
The value saved in the post meta box will serve as an override to the blog default for all comments on a single post
Implemented the default value given by the post
When saving a comment it will now look to see if the visibility value has been set at the post level and apply it's setting if needed.
Note: This only applies if the visibility settings are hidden from the user and a default value is needed