TestSuite: The fatal exit() call has been removed from the globals setup.

The exceptions that occur after this call can be handled by CppUnit, but the
exit() results in the test suite silently exiting without restoring stdout and
stderr.

test_suite/helpers/globals.cxx

@@ -62,7 +62,6 @@ namespace fgtest
 
       if (!foundRoot) {
             std::cerr << "FGData not found" << std::endl;
-            exit(EXIT_FAILURE);
         }
 
       tests_fgdata = globals->get_fg_root();