Accessibility (and bath_type) should be a boolean

**PR is a Work in Progress, do not merge**

@tkwidmer I noticed that access and bath_type both use integers to store info about those attributes. I believe that accessibility is a boolean, in that it can only ever be true or false. I am uncertain if bath_type is a boolean, but guess that it is. **What information is currently stored in bath_type?** What information might be stored on this column in the future?