The file /home/218/database.txt contains a large number of lines of data. Each 
line describes one person: Social security number, birth date (YYYYMMDD), first
name, last name, and zip code.

Here are six unexciting lines from the middle of the file:

    525373469 19630128 Nancy Frankenstein 88539
    525388530 19630228 Darcy Epstein 56906
    525397776 19710519 Frances Cadwallader 88625
    525535897 19361217 Edwin Frogmorton 07004
    525753047 19380123 Alexander Jones 24267
    525780779 19420616 Tom Wilson 39264

You are to write a program that reads this file and stores its information in a 
linked list.

Do this in the style we used in class. It certainly does not need to be exactly
the same, just in the same style. Do not be led astray by any nonsense you
might find on the web. Make a struct (or class) to represent a person. Just a
person, nothing else. Make a struct (or class) to represent a link in the list.
Make a class to represent the whole linked list, and give it useful methods.

Once your program has constructed the list, it should enter an interactive loop,
taking commands from the user:

FIND firstname lastname
   - display all information about the named person,
     your program must not crash if no such person exists!

ALL lastname
   - display all information about all people who have the given last name.

ZIP zipcode
   - make a new linked list of all people living in the given zip code,
     then display the entire contents of that linked list.

OLDEST
   - print the name and zipcode of the oldest person in the database.

DELETE firstname lastname
   - remove the named person from the list.

EXIT
   - exit from the program.

Make sure your program's output is neat and tidy. No unnecessary prompts.