trun: be more explicit when ncc0 or a.out crashes
trun: be more explicit when ncc0 or a.out crashes

Known (accepted) crashes have most of their output silenced, but we
still get the "Abort ..." message from bash. But it isn't clear which
test produced it. So we now print a non-suppressed message about such
crashes to make it easier to understand the origin of the bash message.

nanocritical/n,nanocritical/n,nanocritical/n,nanocritical/n