1. Generating and running atest

The Makefile in this directory compiles your version of probs.c with
additional code to create a program named atest.  

Give the command:
	make atest
to compile the code.

Run the program with the command:
	./atest [Optional command line arguments]

2. What atest does.

Atest tests your procedures for correctness by running a number of test
cases.  It does not guarantee exhaustive evaluation.

Command Line options for atest:
   -v N:  Set verbosity to level N
      0: Only give final scores
      1: Also report individual correctness scores (default)
   -f Name: Check only the named function
   -e N: Limit number of errors to report for single function to N
         (Default unbounded)

