On rabbit, the data file can be accessed as /home/www/class/een218/ass7f132.txt
It is social security number
      date of birth
      title
      first name
      last name
      street address
      town
      state
      zip code
for a number of people. The data is not real.

Create a struct to represent a person, read all the data from the file
into a linked list.

Interact with the user to answer simple cumulative database queries

  The general form of an input is
     field equal value
  or field begins value

  for example
     lastname equal betty
  or birth begins 1979

The first such query should produce a new linked list containing
all the records that match. Each subsequent query should refine
the results, producing a new smaller linked list by selecting
matching records from the previous list.

So for example, after giving these three queries
    lastname equal Washington
    town equal Miami
    birth begins 197
the list should contain all people whose last name is Washington,
and who live in Miami, and who were born in the 1960's.

After each query display the number of records now in the list.

Four additional commands should also be processed:

print
  print all currently selected records

clear
  start a new search right from the beginning

save filename
  save the current selection in a file, with exactly the same
  format as the original input file.

exit
  stop.