Database get method change

I split the method get into two separate methods:
 - getAddrByIndex
 - getFieldByIndex
This more clearly documents its intended usage.
FieldSearch change method getEquals

- Renamed the method to findEquals to be
  consistent with the "imagined interface"
  provided by the professor.
- Commented out unimplemented methods
- Changed method to return an arraylist of
  strings.
- Changed method to work with update database class