Description of Simpletest 1.0.1 library import into Moodle

Obtained from http://www.simpletest.org/en/download.html

Changes:
 * test_case.php - added our global $CFG before include() MDL-10064
 * errors.php - added extra PHP5 error types - otherwise you sometimes get PHP notices when running the tests.
 * fixed exception support (MDL-17534) - try/catch in invoker.php and errors.php
 * Bug fix in simpletest.php and test_case.php. Marked with //moodlefix begins,
   //moodlefix ends comments. This has been reported back to the simpletest mailing
   list. Hopefully will be included in a future release.
 * modified run() in test_case.php - skipping tests that need fake db if prefix not set
 * search replace deprecated "=& new"
 * MDL-20876 - replaced deprecated split() with explode()
 * test_case.php - added TIME_ALLOWED_PER_UNIT_TEST constant which
   resets php time limit for each test function - MDL-24909. Marked with
   comments (replace existing per-class hack in test_case.php).

skodak, Tim, sammarshall