Update address similarity   - Combine first address and second address fields   - make address field all lowercase   - Add clean_address function that:     - Standardizes address generics     - Standardizes address designators
Update address similarity
  - Combine first address and second address fields
  - make address field all lowercase
  - Add clean_address function that:
    - Standardizes address generics
    - Standardizes address designators

nsh87/ehrcorral