MDB Test suite

This provides a primordial version of a test suite for mdb. To run the tests,

run mtest. Tests exist in various subdirectories. The name of the test is

important.

A test must start with either:

o tst - Indicating that it should exit zero

o err - Indicating that it should exit non-zero

A test must end with either:

o mdb - Indicating that the file should be passed as standard input to mdb

o ksh - Indicating that it should be run with ksh

A test may have an optional .out file which if present indicates that the test

should pass if and only if its standard ouput matches its standar error.