This directory is the root of test tree.  The structure of the test directory
tree is patterned after the stages of the Flick compiler.  There are separate
directories to hold the results of each front end, presentation generator, and
presentation back end.  The output from each stage can be verified against
known-good copies of the output files.  Driver programs are compiled and linked
separately.  There is a Makefile in the root of the testing tree that
simplifies the testing process, and a README file to explain everything.
