fix multiple issues in jail selection and scumbag (no bust) feature

- fix issue where no inmate would be selected because the pre-selected inmate
  was on scumbag list and all other inmates had priority > 10

- make scumbag list case insensitive

- fix issue where famless inmate would be treated as scum if scumbag list had
  an empty string element

- do not add empty strings to scumbag list

- show delete button for newly-added scumbag entries

- remove text and button when deleting a scumbag entry
Merge pull request #5 from Baelor/master

fix multiple issues in jail selection and scumbag (no bust) feature