Unable to add custom row label for each views

Sorry for the noise but I had to create a 2nd patch based on the 1.2 code.

My first patch was based on 1.x.

This change will break existing sites.

If you need this feature. Add a setting so users can opt-in.

As per #5 suggestion, I updated the patch to add settings to the form to let users choose whether or not they want to use the Views title for the rows label.

This patch disable the rows_label field only as a visual aid to let users understand that the rows_label's value is not going to be used.