Use the newer automake test driver "parallel-tests". This driver:

Use the newer automake test driver "parallel-tests".  This driver:

* keeps test logs around
* provides parallel testing functionality (with make -jN).

I've also added new functionality in test/Makefile.am which deletes old test logs, ensures that ALL tests are tried (even if units fail), and provides a color-coded summary at the end of the test run, which shows how many units, regressions (per level), and system tests failed (or passed), and provides a link to the log file for further information.

Resolves bug 117.