Update proj1.sh

1) Added a function to append a separate database file to the current database

- The remove function works improperly when two records with identical values in the certain fields (example: two records with the same name, but different addresses, etc.) are removed
   * It will only work properly in this scenario if more than one field is included in the search (name:address - instead of just - name)

- The update function does not work properly either.  It replaces the field specified, but replaces all the other fields with data from the first record.